International Gem Society
Articles by International Gem Society
What’s the Difference Between Gemology and Mineralogy?
There are key differences between gemology and mineralogy. Learn about these disciplines and how studying mineralogy can benefit gemologists.
Read More
Cleo Eye Gemstone Design for a Moissanite
https://vimeo.com/891998005?share=copy
Check out the full-length video on the International Gem Society YouTube Channel.
Jim Buday takes you step by step through...
Read More
Void Reaver Gem Design for a Lab-Created Alexandrite
https://vimeo.com/848434700?share=copy
Check out the full-length video on the International Gem Society YouTube Channel.
About Jim Buday
Jim Buday was born and...
Read More
D20 Gemstone: a Dungeons and Dragons-Inspired Design
https://vimeo.com/839864900?share=copy
Check out the full-length video on the International Gem Society YouTube Channel.
About Jim Buday
Born and raised in...
Read More
Appraising Turquoise: Challenges for Gemologists
What do gemologists need to know when appraising turquoise? Learn what are the main value factors to consider and the...
Read More
Turquoise Treatments and Synthetics Guide
Almost all turquoises receive enhancements for jewelry use. Learn how to identify the most common turquoise treatments and synthetic options....
Read More
Traditional Turquoise Jewelry Styles
People have prized turquoise jewelry for millennia. Learn about these traditional turquoise designs that still influence modern artisans.
Read More
How to Cut a Moissanite: Rupee Step Cut
https://vimeo.com/video/861664423
Check out the full-length video on the International Gem Society YouTube Channel.
About Jim Buday
Born and raised in...
Read More
Turquoise Color and the Color Turquoise
Is all turquoise turquoise color? Learn about this gem's most popular natural colors and how people have prized them for...
Read More
Turquoise Care Guide
Beautiful turquoises tend to show wear over time. Our turquoise care guide will show you the best ways to clean...
Read More
How Do Turquoises Form?
Turquoise gems can show many beautiful variations. Learn how turquoises form and how geology affects their color, shape, and durability....
Read More
16 Black Gemstones (How Many Do You Know?)
Some black gemstones are so well-known their names have become synonymous with the color black. Others are less well-known by...
Read More
What are Balas Rubies and Ruby Spinels?
For centuries, balas rubies were prized by royalty. Learn what happened after gemologists identified these gems as red spinels instead....
Read More
Four Famous Spinels
Although the world’s most famous spinels are named “rubies,” these gems are distinct species. Learn the stories behind four of...
Read More
How Do Spinels Form?
Available in many colors, spinels are becoming more popular with consumers. Learn how spinels form and how these gemstones get...
Read More
Spinel Inclusions
The materials trapped inside gems hold a wealth of information. Learn what the most common types of spinel inclusions reveal...
Read More
What are Cobalt Spinels?
Learn how gemologists identify cobalt spinels and what qualities you should look for when buying these beautiful, vivid blue gemstones....
Read More
Choosing a Spinel Engagement Ring Stone
Our spinel engagement ring stone guide can help you learn about this beautiful, colorful, durable, but little-known gemstone.
Read More
Spinel Treatments and Enhancements
Spinels are rarely treated, but gemologists should know how to detect spinel treatments. Learn about filling, heating, and diffusion.
Read More
Anniversary Gifts By Year
The anniversary gift for year 1 is gold, and the anniversary gift for year 2 is garnet. Our chart tells...
Read More
Does Synthetic Jade Exist?
You might find synthetic jade for sale, but is this material really lab-made jade or something else? Learn how to...
Read More
Distinguishing Common Jade Lookalikes
Our table comparing the properties of jade lookalikes with natural jade will help gemologists distinguish authentic jade from simulants.
Read More
Is Xinjiang Nephrite Banned in the US?
How does the Uyghur Forced Labor Prevention Act of 2021 affect imports of Xinjiang nephrite jade from China? Learn what...
Read More
Jade Color Trade Names
Jade color trade names describe prized hues and patterns in jadeite and nephrite stones. Learn about the most popular and...
Read More
Do the 2021 US Myanmar Sanctions Affect the Jade Trade?
What do the 2021 Myanmar sanctions cover and will they affect the jade trade? Learn about the origins, scope, and...
Read More
Nephrite Jade Value, Price, and Jewelry Information
Nephrite is one of the two distinct minerals commonly known as jade. While nephrite doesn't match the variety or the...
Read More
Jade Engagement Ring Guide
Jade is an elegant choice for an engagement ring stone. Our jade engagement ring guide will show you how to...
Read More
Maw Sit Sit Guide
Learn everything you need to know about maw sit sit, a rare, vibrant green gem rock used to make beautiful...
Read More
Jade Sources
Jadeite and nephrite occur all over the world. Learn about the most notable and productive gem-quality jade sources..
Read More
Nephrite Jade Carvings from Ancient China
Nephrite jade carvings can teach us about Ancient China. See how ideas of transformation are reflected in numerous ritual objects....
Read More
Jade Toughness and Care
Jade toughness is legendary. However, this gem isn’t indestructible. Learn what makes jadeite and nephrite so tough and how to...
Read More
How Does Jade Form?
The minerals known as jade, jadeite and nephrite, appear similar but have different properties. Learn how these materials form geologically....
Read More
Variscite Value, Price, and Jewelry Information
With beautiful green to blue-green colors and interesting patterns, variscite is a popular hobbyist material for cabochons.
Read More
Does Chrysoprase Jewelry Fade?
Should you wear chrysoprase jewelry only at night to protect the gem’s striking green color? Learn the facts here.
Read More
Legrandite Value, Price, and Jewelry Information
Too soft for jewelry use, legrandite is a popular collector’s mineral because of its intense yellow color and aesthetic crystal...
Read More
Sapphire Symbolism
Beautiful blue colors and the star stone effect have influenced sapphire symbolism through the ages. Learn more about the legends...
Read More
Smithsonite Value, Price, and Jewelry Information
Smithsonite occurs across the globe, but facetable crystals are extremely rare. These gems can show a wide range range of...
Read More
Vivianite Value, Price, and Jewelry Information
Vivianite is so fragile and soft, any faceted gems would be difficult to handle safely, let alone wear. Nevertheless, its...
Read More
Can You Identify Gems Without Seeing Gemstone Colors?
Did you know most gem species can be distinguished without the element of color? Learn the role gemstone colors play...
Read More
Eudialyte Value, Price, and Jewelry Information
Although lapidaries can cut cabochons and decorative objects from massive or translucent eudialyte crystals, transparent material suitable for faceting is...
Read More
Price and Value: Factory-Cut vs Custom-Cut Gemstones
How does faceting affect gem value? Unique custom-cut gemstones command high prices. Learn how custom cutting compares to factory cutting....
Read More
Onyx Value, Price, and Jewelry Information
For millennia, artisans have carved intricate cameos from black-and-white onyx. Solid black onyxes, faceted or cabbed, are also popular jewelry...
Read More
Peridot Buying Guide
Our peridot buying guide can help you learn how these gems are graded, what to avoid, and how to identify...
Read More
What are Lab-Grown Sapphires?
Learn how lab grown sapphires are made and how gemologists can distinguish natural from synthetic sapphires.
Read More
Covellite Value, Price, and Jewelry Information
Although covellite has attractive blue colors and shows iridescence, this rare mineral is difficult to cut. You can scratch it...
Read More
Sphalerite Buying Guide
Our sphalerite buying guide can help you learn how these gems are graded, what to avoid, and how to identify...
Read More
Bytownite Value, Price, and Jewelry Information
Although bytownite occurs throughout the world, this feldspar variety is rarely encountered in gem-quality condition.
Read More
Villiaumite Value, Price, and Jewelry Information
A little-known and rare collector’s gemstone, villiaumite is very difficult to facet. Its toxicity also makes it inadvisable to handle...
Read More
Gemstone Faceting Terms: A Glossary for Students
A glossary of frequently encountered gemstone faceting terms for the student gemologist. Our list covers gemology, gem cutting, and equipment....
Read More
Choosing the Best Faceting Wax for Your Task
Faceting wax or dop wax comes in different colors with different melting points. Learn how to choose the wax best...
Read More
September Birthstone: Sapphire
What is the birthstone for September?
The birthstone for September is sapphire. Sapphires are members of the gem species corundum....
Read More
The World’s Largest Emeralds
Emerald crystals can grow very large. Learn about some of the world’s largest emeralds, whether rough, faceted, or carved.
Read More
Heliodor Value, Price, and Jewelry Information
Heliodor is a member of the beryl family. This stone is known for its range of yellow colors — from...
Read More
Fantasy Gem Designs: Cutting Techniques
Fantasy gem designs combine elements from faceted and cabbed stones as well as artistic embellishments. Learn the basics of this...
Read More
Emerald Origins: History and Identification
Emeralds from different sources can vary in quality. Learn how to identify emerald origins by analyzing the optical and physical...
Read More
Proustite Value, Price, and Jewelry Information
Proustite crystals have magnificent red colors and good brilliance. Although facetable, they're too soft for jewelry use but highly desired...
Read More
How to Facet Gems
What does it take to facet gems? Patience and HAI, locking the gem at the right height, angle, and index...
Read More
Wulfenite Value, Price, and Jewelry Information
Although aesthetically magnificent wulfenite crystals are often too thin, soft, and sensitive to cut for jewelry, rare faceted pieces are...
Read More
Gold Refining Advice for Jewelers
Before you turn the alloyed gold you got a great deal on into gold jewelry, carefully consider what gold refining...
Read More
What are Black Diamonds and Carbonados?
Most black diamonds used in jewelry are enhanced, but natural black-colored diamonds do exist. Learn more about these as well...
Read More
Rutile Value, Price, and Jewelry Information
Though perhaps best known as inclusions within other gems, rutile crystals themselves can be faceted or cabbed as curiosities for...
Read More
Xonotlite Value, Price, and Jewelry Information
Xonotlite is strong and can take a good polish. However, these gems are extremely rare, both as a species and...
Read More
Jewelry Making Tools: An Introduction
Jewelry making is a great way to tap into your creative side. Learn what jewelry making tools you’ll need to...
Read More
Leucite Value, Price, and Jewelry Information
Although abundant in various lava rocks, leucite is extremely rare in gem-quality form and often has a milky or cloudy...
Read More
A World of Crystals
We live in a world of crystals. Learn what they are and where you can find them, from deep underground...
Read More
Properly Charging Ceramic Laps
A ceramic lap is an excellent choice for polishing gemstones. Here is a guide for properly charging ceramic laps and...
Read More
Zektzerite Value, Price, and Jewelry Information
Small, cuttable crystals of very rare zektzerite are found only in a mountainous location in Washington state. Faceted pieces would...
Read More
Petalite Value, Price, and Jewelry Information
Gem-quality, colorless, facetable petalite is rare and desirable to collectors. More so if the stones are large and free of...
Read More
Tips for Polishing Synthetic Corundum
Polishing synthetic corundum without leaving pits requires certain techniques and tools. Get expert lapidary advice here.
Read More
Rhodonite Value, Price, and Jewelry Information
Ranging in color from pink to a fine rose red, rhodonite is a popular material for jewelry and decorative objects....
Read More
Polishing Gemstones for Beginners: Pre-Polishing Advice
Polishing gemstones is difficult to master. Pre-polishing plays a major role in how well a gem can take a polish....
Read More
Top Spots for Gem Hunting in the US
Visit one of the top gem hunting spots in the US. Go alone or with the family. A gemology-themed vacation...
Read More
Apophyllite Value, Price, and Jewelry Information
Although not suitable for jewelry, apophyllite is a popular collector's piece. Perhaps the whitest of all gems, some cut specimens...
Read More
Gem Formation: How are Gemstones Created?
Gem formation usually involves mineral crystallization and other geological processes. Learn how these affect the gemstone properties gemologists study.
Read More
Cuprite Value, Price, and Jewelry Information
One of the rarest of all facetable gems, cut cuprites can show magnificent deep red color. However, these beautiful stones...
Read More
Gemstone Optical Properties
Learn how gemstone optical properties, like refractive index and pleochroism, help gemologists identify gems and lapidaries choose cuts.
Read More
Sapphire Buying Guide
Long associated with royalty, sapphires are some of the most popular (and expensive) gems in the world. Our sapphire buying...
Read More
Anhydrite (Angelite) Value, Price, and Jewelry Information
Rare and difficult to cut, anhydrite is seldom faceted. However, this material can be carved into beautiful objects. “Angelite,” a...
Read More
Parisite Value, Price, and Jewelry Information
More well-known as rare inclusions in emeralds, parisite crystals are usually small and seldom faceted.
Read More
Spinel Buying Guide
Our spinel buying guide can help you learn how spinels are graded and how to identify a high-quality stone or...
Read More
The Foundation Stones of the New Testament
Commentaries on the foundation stones of the Book of Revelation influenced the development of the Western birthstone system. Learn more...
Read More
Is Golden Beryl a Good Gem Choice for Jewelry?
Golden beryl, also known as heliodor, can display rich colors and is an excellent gem choice for jewelry. Learn more...
Read More
Diamond Rough and Equipment for the Occasional Diamond Cutter
Finding good diamond rough and the right equipment can be challenging for a non-professional diamond cutter. Learn what to look...
Read More
Report Card for the Best Engagement Ring Insurance in 2024
Independent report by International Gem Society on the Best Engagement Ring Insurance on the Market in 2022.
Read More
Euclase Value, Price, and Jewelry Information
Although hard enough to be worn safely in jewelry, euclase in beautiful colors is rare over a few carats. It’s...
Read More
Gemstone Wholesale Prices and the Art of Appraising
There are few guides to gemstone wholesale prices. However, appraising gemstones requires in-depth knowledge and experience, not just price lists....
Read More
Choosing the Best Colored Gemstones for Engagement Rings
Looking for alternatives to a classic diamond engagement ring? Learn about your options and see some wonderful photos of colored...
Read More
Jewelry Nomenclature: Jewelry Attachments and Various Findings
Jewelry attachments are the pieces used to hold jewelry items together. Learn about the most popular types as well as...
Read More
Garnet Symbolism
Garnet symbolism is rich and varied. The January birthstone has inspired many legends and popular associations with love, friendship, light,...
Read More
Phenakite Value, Price, and Jewelry Information
Rare phenakite is a very hard gem material suitable for jewelry. Usually colorless, cut stones have little fire but can...
Read More
Jewelry Nomenclature: Gem Earrings
Earrings are available in many styles. Learn to identify the most popular types of metal and gem earrings and the...
Read More
What Were the Gemstones of the Breastplate of Aaron?
In Exodus, the breastplate of Aaron was said to hold 12 gems. However, the gemological identities of the stones, like...
Read More
Jewelry Nomenclature: Gem Bracelets and Necklaces
Bracelets and necklaces share much of their terminology. Learn the names and functions of the different parts of these popular...
Read More
Recommendations for Polishing Silver Jewelry
These cleaning tips will make polishing silver jewelry a little easier. Learn how to prevent tarnish and how to clean...
Read More
Tugtupite Value, Price, and Jewelry Information
Gem collectors prize tugtupite, the "Reindeer Stone," for its rich colors and intense reaction to ultraviolet light. Sporadically used in...
Read More
Jewelry Nomenclature: Gem Rings
Though rings may come in many styles, gem cutters will regularly encounter a few common types of gem rings. Learn...
Read More
The Pocket Spectroscope: A Quick Guide for Gemologists
An inexpensive pocket spectroscope can be great for student gemologists as well as pros who need to identify gems while...
Read More
Serandite Value, Price, and Jewelry Information
To date, only one locality — Mont St. Hilaire, Quebec, Canada — has produced facetable serandite. These extremely rare gems...
Read More
Cutting Star Gemstones: Tips for Beginners
Want to start cutting beautiful star gemstones? Here are some helpful gemological resources for novice lapidaries and jewelers.
Read More
How to Buy a Diamond Online (Tips and Tricks)
If you want to buy a diamond online rather than at a brick-and-mortar store, you’ll need to be well-informed about...
Read More
Humite Value, Price, and Jewelry Information
Clinohumites and chondrodites can make beautiful gemstones with rich colors, but these members of the humite mineral group are rare...
Read More
Do Emeralds and Peridots Look Good Together?
Although emeralds and peridots are both green gems, differences in shade might make it hard to pair them in jewelry....
Read More
How to Grade Fancy Cut Diamonds
Fancy cut diamonds can have any finished shape, except round. These stones have their own grading criteria, in particular regarding...
Read More
Weloganite Value, Price, and Jewelry Information
Truly a collector’s gem, weloganite is very rare and seldom cut. This stone can show pale yellow colors.
Read More
How to Orient Sapphires with Silk Inclusions
Silk inclusions in sapphires are hard to detect. Learn to pick the best orientation and cut for these gems. You...
Read More
Colemanite Value, Price, and Jewelry Information
Colemanite is an abundant mineral, and transparent material isn’t rare. However, gem cutters rarely facet these typically pale stones. Difficult...
Read More
2021 Black Friday & Cyber Monday Deals on Diamond Rings
Online diamond sellers have occasional sales throughout the year but it's time-consuming to keep track of them all. One thing...
Read More
Facts About Diamonds vs Diamond Buying Myths
You’re sure to encounter many myths when diamond buying. Learn these facts about diamonds so that you can find the...
Read More
Dolomite Value, Price, and Jewelry Information
Although transparent dolomite crystals are fairly abundant and popular collector’s items, faceted gems are soft, fragile, and rarely seen in...
Read More
How Much Should You Spend on a Diamond Engagement Ring?
The old rule about spending a month's salary on a diamond engagement ring is just that: old. Learn how you...
Read More
How to Dry Opals Safely
Opals should be handled with care. If you buy opals that have been kept in water, follow these instructions to...
Read More
Cryolite Value, Price, and Jewelry Information
Typically colorless with a “sleepy” look, cryolite is rarely found in nature. Rough suitable for gem faceting is extremely scarce....
Read More
Cobaltite Value, Price, and Jewelry Information
Cobaltite cabochons can have a lovely metallic luster. However, this gem material is very seldom faceted.
Read More
How Can a Gemstone’s Optic Sign Change?
A gemstone's optic sign may be listed as either + or -. Learn whether impurities in a specific stone or...
Read More
Buying a Heart-Cut Diamond (Tips and Tricks)
This solitaire ring displays the distinctive heart-shaped stone perfectly. This romantic diamond shape is also ideal for a 14K rose...
Read More
Chambersite Value, Price, and Jewelry Information
Chambersite is an exceedingly rare mineral. Although it has properties suitable for jewelry use, its crystals occur in very small...
Read More
Opal Wearability and Jewelry Tips
Are opals too delicate for jewelry? Learn how to choose the right settings for opal wearability, so you can enjoy...
Read More
Barite Value, Price, and Jewelry Information
Massive white barite (also called known as baryte) looks like marble and could be used for decorative purposes. In spite...
Read More
Anorthite Value, Price, and Jewelry Information
The rarest plagioclase feldspar, anorthite is very rarely faceted.
Read More
Lapidary Tips for Polishing Girdles
What are the best techniques and tools for polishing girdles? Learn how to complete your faceted gems quickly and easily...
Read More
Two-Carat Diamond Rings: Buying Top Quality
Searching for a 2 carat diamond ring that is a real piece of eye candy? Shopping for this diamond size...
Read More
Datolite Value, Price, and Jewelry Information
Polished and sliced datolite nodules can show off very attractive colors. Datolite is a popular collector’s mineral, but faceted and...
Read More
What Does the GIA Colored Gem Grading Code Mean?
The GIA grading system describes gem color in terms of hue, tone, and saturation. Learn what the abbreviations and numbers...
Read More
Rhodochrosite Value, Price, and Jewelry Information
Beautiful rose red to pink rhodochrosite crystals are popular with mineral collectors. Although very soft, opaque stones have been fashioned...
Read More
The Best Radiant Diamond Engagement Rings for Every Budget
Radiant diamonds combine symmetry, fire, and brilliance to offer, in one stone, the best traits of round and princess cut...
Read More
Descriptive Crystallography for Gemologists
Crystallography is the study of crystalline solids. Learn the most common terms gemologists use to describe the structure of crystal...
Read More
Scorodite Value, Price, and Jewelry Information
With lovely colors and intense pleochroism, faceted scorodite is a prize for collectors of the rare and unusual. However, it’s...
Read More
Anglesite Value, Price, and Jewelry Information
Although anglesites with pale colors can show great dispersion and brightness, they’re difficult to cut and inadvisable to wear. Faceted...
Read More
How to Choose a Metal for Your Engagement Ring
Platinum and gold are the two most popular and most expensive metals for engagement rings. But are they the best...
Read More
Kyanite Value, Price, and Jewelry Information
Kyanite’s physical properties make it very difficult to facet. However, it’s a popular collector’s gem, especially in sapphire-blue colors.
Read More
Amazonite Value, Price, and Jewelry Information
A green to blue-green variety of microcline, amazonite makes a wonderful gemstone for cabbing and carving.
Read More
How to Modify a Powder Scale for Specific Gravity Testing
Learn how to modify a powder scale for specific gravity testing. A handmade wire basket will make this easy-to-use scale...
Read More
Siderite Value, Price, and Jewelry Information
Siderite is difficult to cut, but this light brown collector's gem has yielded faceted pieces of great beauty.
Read More
Guide to Organizing Your Gemstone Collection
Learn how to organize your gemstone collection. Choose the storage and display options that are right for you and create...
Read More
Serpentine Value, Price, and Jewelry Information
The gem material known as serpentine actually encompasses several related mineral species. For millennia, people have cut serpentines into beautiful...
Read More
Anatase Value, Price, and Jewelry Information
Anatase occurs in many beautiful colors, such as deep indigo and amber yellow. However, these rare gems are seldom transparent...
Read More
Purpurite Value, Price, and Jewelry Information
Purpurite is too soft for jewelry wear and never transparent. Nevertheless, lapidaries have cut cabochons from this material with magnificent...
Read More
Best Rough Gemstones for Beginning Faceting
Learn which rough gemstones are ideal for beginning faceting practice. A progression of relatively inexpensive gem species can teach important...
Read More
Why Choose a Barion Cut?
Gem faceters must consider factors like brilliance, color, and faceting yield before choosing a cut style. Learn what a Barion...
Read More
Creedite Value, Price, and Jewelry Information
Probably fewer than a dozen creedite gems have ever been faceted. This rare mineral is rarer still as a cuttable...
Read More
The Ultimate Guide to the Best Jewelry Insurance Companies
Our jewelry insurance guide reviews the policies of the top eight companies. Learn what to look for so you can...
Read More
Ludlamite Value, Price, and Jewelry Information
Ludlamite has a lovely green color, but cut stones are extremely rare. Large crystals of this phosphate mineral are known...
Read More
Jade Symbolism
Both jadeite and nephrite have inspired beautiful works of art and a rich body of lore. Jade symbolism covers themes...
Read More
Standard Gem Sizes Chart
Will your gem fit in a standard setting? Use this chart of standard gem sizes for popular cuts and also...
Read More
Prosopite Value, Price, and Jewelry Information
Prosopite is usually a nondescript mineral with no gem significance. However, beautiful blue specimens are sometimes cut for jewelry.
Read More
Hematite Value, Price, and Jewelry Information
Hematite has a long history of use as a pigment. As a gemstone, this material is often carved but very...
Read More
Wavellite Value, Price, and Jewelry Information
Wavellite is a very attractive mineral, well-known to collectors. Its radial aggregate crystal clusters can be cut into extremely interesting...
Read More
Stibiotantalite Value, Price, and Jewelry Information
Rare stibiotantalite possesses an interesting mix of physical and optical properties that help distinguish it from other earth-toned gemstones. However,...
Read More
Active Promo Codes for Diamond Rings and Jewelry
Updated July 23, 2022. Up-to-date promo codes, coupons, and sales to save you money on diamond rings, engagement rings, jewelry,...
Read More
Appraising Opals
Opals are unique gems with their own unique terminology. Learn the modern standard system for classifying and appraising opals used...
Read More
Sodalite Value, Price, and Jewelry Information
Typically blue, durable, and easy to cut, sodalite is highly desired by hobbyists. Even stones that lack transparency make lovely...
Read More
What is a Gem?
Even the most general definition of a gem has many exceptions. Learn what qualities have been used to identify gemstones...
Read More
Mellite Value, Price, and Jewelry Information
Mellite is a rare and unusual organic gemstone. Although soft and fragile, the “honey stone” is quite beautiful when cut....
Read More
Should I Make an Investment in Bargain Rubies?
Do you have an offer for bargain rubies that's too good to be true? Learn what you need to know...
Read More
Gemstones with Health Benefits
Since ancient times, people have believed gems could have healing properties. Let’s take a look at some popular gemstones with...
Read More
Fluorite Value, Price, and Jewelry Information
Although too fragile for most jewelry use, fluorites are often faceted for collectors. They occur in a wide range of...
Read More
Grandidierite Value, Price, and Jewelry Information
A rather rare mineral, lovely blue-green grandidierite is seldom seen in gem or jewelry collections. Translucent material is sometimes cut...
Read More
Can Wearing Gems That Touch Your Skin Improve Your Health?
Will wearing gems that touch the skin of your finger bring you health benefits? Before you buy any ring stone,...
Read More
The Best Asscher Cut Diamond Engagement Rings For Every Budget
Asscher diamonds get their name from the Royal Asscher Diamond Company, the Dutch company that invented the cut. It features...
Read More
The Best Round Engagement Rings For Every Budget
Round cut diamonds have been around for centuries. As a timeless diamond cut, they offer exceptional resilience in popularity when...
Read More
The Best Cushion-Cut Engagement Rings For Every Budget
Cushion-cut diamonds are the second most sought-after diamonds on the market today. The cut's popularity comes from combining two other...
Read More
Gem and Jewelry Insurance Quotes: Four Money-Saving Questions
How can you get lower gem and jewelry insurance quotes? Asking a potential insurer these four questions could help lower...
Read More
Is Lab-Created Alexandrite Real Alexandrite?
Natural alexandrite is popular and rare, which creates a market for synthetics. But is lab-created alexandrite real alexandrite? Learn the...
Read More
Jewelry and Gemstone Insurance: Nine Questions You Need to Ask
Before you buy jewelry and gemstone insurance, learn what to ask insurance companies and make sure the policy meets your...
Read More
Bloodstone Value, Price, and Jewelry Information
Also known as heliotrope, bloodstone is the traditional March birthstone. This dark green, opaque chalcedony with red to orange spots...
Read More
Does Homeowners Insurance Cover Gems and Jewelry?
Your homeowners insurance may cover gems and jewelry, but don’t assume it covers all risks or the value of your...
Read More
Is Uranium Glass Safe to Facet?
Uranium glass, or Vaseline glass, is a prized collector's item and is generally safe to handle. But is it safe...
Read More
The Best Oval Diamond Engagement Rings for Every Budget
Oval diamonds are consistently one of the most popular diamond cuts on the market. Oval diamond engagement rings are popular...
Read More
Kämmererite Value, Price, and Jewelry Information
A beautiful but rare mineral, kämmererite is extraordinarily difficult to facet. As a result, the availability of cut gems is...
Read More
Jewelry and Gemstone Appraisals for Insurance
Need insurance for your jewelry? You’ll need jewelry and gemstone appraisals. Learn what info they should include and who to...
Read More
Diamond Cutting for Hobbyists: Getting Started
With study, care, and the right tools, hobbyist gem cutters can add diamond cutting to their repertoire. Get started with...
Read More
Jet Value, Price, and Jewelry Information
Historically a popular black gem, jet has declined in popularity in modern times. Although jet jewelry has been long associated...
Read More
Are There Any Fair Gemstone Pricing Formulas?
Can gemstone pricing formulas help gem merchants and buyers make fair deals? Learn what factors should play a role in...
Read More
What’s the Difference Between Mineral Samples and Gem Rough?
For faceting, the distinction between gems and minerals is usually clarity. However, learn why the decision to cut may be...
Read More
Aquamarine Grading and Pricing
Aquamarines are evaluated based on the Four Cs: color, clarity, cut, and carat. Learn how each factor affects aquamarine grading...
Read More
Learn How to Use the IGS Gem Price Guide
The IGS Gem Price Guide covers commonly traded colored gemstones as well as more unusual, collectible gems. The values listed...
Read More
Spurrite Value, Price, and Jewelry Information
An attractive but uncommon mineral, spurrite has seldom been cut as a gemstone. However, it has the hardness and tenacity...
Read More
Kurnakovite Value, Price, and Jewelry Information
Kurnakovite is difficult to cut, inadvisable to wear, and usually colorless. Consequently, faceted specimens are extremely rare.
Read More
Rhodizite Value, Price, and Jewelry Information
Rhodizite is tough enough to make an excellent jewelry stone. However, it's quite a rare mineral. Faceted specimens are extremely...
Read More
What is Gemstone Dispersion?
Learn what gemstone dispersion means, what causes it, and how it relates to other optical effects.
Read More
A Tribute to Bench Jewelers
Bench jewelers work very hard with little or no acknowledgement, creating and repairing treasured possessions. These stories pay tribute to...
Read More
Epidote Value, Price, and Jewelry Information
The epidote mineral supergroup contains many related species of interest to collectors. However, epidote itself is the one most likely...
Read More
Creating Ring Mountings for Deep-Cut Gemstones
Deep-cut gems like Barions may not fit in standard ring mountings. Jewelers can try to find special mounts or custom...
Read More
Obsidian Value, Price, and Jewelry Information
Obsidian is the most common form of natural glass and occurs in many attractive varieties. Since prehistoric times, people have...
Read More
Phenomenal Gems: Cat’s Eyes, Star Stones, and More
Phenomenal gems seem to do magical things with light. Learn the science behind optical effects like cat’s eyes and star...
Read More
Pollucite Value, Price, and Jewelry Information
Colorless pollucites lack fire when cut and are usually small. However, this very rare cesium mineral is a coveted collector's...
Read More
Aquamarine Enhancements
The most common aquamarine enhancements try to turn blueish green stones pure blue. Learn how heating and other aquamarine treatments...
Read More
Aquamarine Durability
Aquamarines are fairly tough jewelry stones, but they do have some weaknesses. Learn about aquamarine durability and what precautions you...
Read More
Synthetic Aquamarines
Synthetic aquamarines are relatively rare, but gemologists may encounter them. Learn how these stones are made and how to distinguish...
Read More
Aquamarine Setting Advice
Aquamarines can look great, but what’s the best way to mount them? Novice jewelers should learn the pros and cons...
Read More
Distinguishing Aquamarine Imitations
How can gemologists quickly distinguish aquamarines from aquamarine imitations? We’ll review some common lookalikes and their most notable differences.
Read More
Phosgenite Value, Price, and Jewelry Information
Rare phosgenite typically shows pale colors. This material is difficult to cut and too soft for jewelry wear. However, its...
Read More
Aquamarine Sources
Aquamarines are popular gemstones and can be found in many areas worldwide. Learn about some prized varieties and the most...
Read More
Cerussite Value, Price, and Jewelry Information
As beautiful as a diamond, a faceted cerussite actually has higher dispersion and usually excellent transparency, colorless or light body...
Read More
How Do Aquamarines Form?
The March birthstone, aquamarine is a popular gem. Learn how aquamarines form, what they look like, and how they get...
Read More
Milarite Value, Price, and Jewelry Information
Very rare milarite crystals can occur in green and yellow colors. Transparent material can yield small but pleasant looking faceted...
Read More
Six Famous Aquamarines
Aquamarines have been cut into many large and beautiful gemstones. Let’s take a look at six of the world’s most...
Read More
Magnesite Value, Price, and Jewelry Information
Transparent, gem-quality magnesite is rare and beautiful, with colors ranging from colorless, white, and gray to a yellowish brown.
Read More
Amber Symbolism
Amber has a long history of ornamental use and popular associations with animals, energy, and the Sun. Learn more about...
Read More
Eosphorite Value, Price, and Jewelry Information
Faceted eosphorites in pale colors are quite attractive and easy to cut. However, these very rare gems are too soft...
Read More
Sapphirine Value, Price, and Jewelry Information
Sapphirines are durable but very rare gemstones. Although named after their typically sapphire-blue color, these gems can occur in different...
Read More
Does Refractive Index Affect Gemstone Brightness?
Many factors contribute to gemstone brightness. Learn the role a gem's refractive index plays and the difference between gemology theory...
Read More
Lazulite Value, Price, and Jewelry Information
Lazulite makes a magnificent, deep blue gemstone. Although the mineral itself occurs widely, gem-quality rough is limited. Specimens are prized...
Read More
Recommended Diamond Grading Tools for Novices
Identifying diamonds requires the right equipment. Learn what diamond grading tools novice professionals or hobbyists need.
Read More
Adamite Value, Price, and Jewelry Information
Although adamite occurs in many localities, it's very rarely cut as a gem. This mineral is much too soft and...
Read More
Staurolite Value, Price, and Jewelry Information
Staurolite crystals in opaque cross shapes are popular gemstones. However, this material is very rarely transparent or facetable. These dark...
Read More
Amblygonite Value, Price, and Jewelry Information
Amblygonite gems are usually pale straw yellow. Although they are too soft and cleavable to make good ring stones, collectors...
Read More
Celestite Value, Price, and Jewelry Information
Soft, fragile, and hard to cut, celestite or celestine is seldom seen in gem collections. These gems are usually colorless...
Read More
Faceting Tips for Exotic Gemstones
Some gems are seldom faceted because they're rarely found in nature or rarely used for jewelry. Learn a few tricks...
Read More
Rubellite Tourmaline Buying Guide
Our rubellite buying guide can help you learn how rubellites are graded, what to avoid, and how to identify a...
Read More
Paraíba Tourmaline Value, Price, and Jewelry Information
Discovered in 1989, paraíba tourmalines are among the world’s most prized gemstones. These rare gems are renowned for showing intense...
Read More
Chrome Tourmaline Buying Guide
Rare chrome tourmaline can show an emerald-like green color. With a highly desired color and tourmaline's excellent qualities as a...
Read More
Some Advice for Cutting Tourmaline Gemstones
Cutting tourmaline can be difficult. Some gems seem to shatter easily. Learn faceting techniques to minimize this risk as well...
Read More
Verdelite (Green Tourmaline) Buying Guide
Looking for a tourmaline jewelry stone? If you like green and you're on a budget, green tourmaline or verdelite is...
Read More
What is a Crystal?
Learn the scientific definition of crystal used by gemologists and answer some basic questions about what is and is not...
Read More
What is a Gem Reflectometer?
What’s the difference between a reflectometer and a refractometer? If you’re interested in studying or buying gems, learn the facts...
Read More
What is the Usambara Effect In Gemstones?
The Usambara effect is a gemstone color change phenomenon distinct from pleochroism or the alexandrite effect. Tourmaline and other species...
Read More
Are There Color Change Diamonds?
A classic chameleon diamond can change color from green to yellow under certain conditions. Learn more about this process and...
Read More
Can Diamonds Burn?
Diamonds may form under intense heat and pressure, but under what conditions can diamonds burn? Learn the science behind a...
Read More
What Causes Fuzzy Refractometer Readings?
Fuzzy refractometer readings may be the result of poorly faceted gems, the wrong amount of refraction liquid, and even stone...
Read More
How to Estimate Gem Weight in a Jewelry Setting
Although you can't weigh a gemstone in a jewelry setting, you can get a close approximation of the gem weight...
Read More
What are Gemstone Absorption Spectra?
Learn how gems absorb wavelengths of light and how gemologists use gemstone absorption spectra to identify gems. There’s more to...
Read More
How to Re-Polish a Refractometer Hemicylinder
The glass used to make refractometer hemicylinders is susceptible to tarnish. Here's a step-by-step guide for re-polishing a refractometer hemicylinder....
Read More
One Carat Oval Diamonds: A Complete Shopping Guide
One-carat oval diamonds are versatile alternatives to one-carat rounds. Our guide can help you find the right oval-cut diamond for...
Read More
Spectroscope Instructions for Novice Gemologists
The spectroscope is one of gemology’s principal tools. Our basic spectroscope instructions will teach you how to operate and calibrate...
Read More
Specific Gravity Testing Part 5: Using Heavy Liquids
Using heavy liquids to measure a gemstone's specific gravity poses some health hazards. Learn the techniques and precautions that gemologists...
Read More
Specific Gravity Testing Part 3: Calculating Specific Gravity with an Electronic Scale
You can use an electronic scale for calculating specific gravity if you have the right accessory, a hanging basket for...
Read More
Specific Gravity Testing Part 2: Using a Balance Scale or a Hanneman Specific Gravity Scale
Using a balance scale to test specific gravity is a recommended practice in gemology. Learn to make your own scale...
Read More
Gemstone Physical Properties
The optical properties of gems attract our eyes and can give a cut stone a unique character. However, gemstone physical...
Read More
Specific Gravity Testing Part 1: Definitions
Learn specific gravity testing methods for gem identification. Our 5-part introductory series starts with the basics and key definitions.
Read More
Corundum Treatments
Corundum gems receive more types of treatments than any other stones. Learn how to test rubies and sapphires for signs...
Read More
Color Change Garnet Value, Price, and Jewelry Information
Any stone that changes color under different types of light is a rare treat for collectors. Color change garnets show...
Read More
Gemstone Treatment Codes
The AGTA has proposed the use of gemstone treatment codes to promote disclosure and a common language for these procedures....
Read More
How Does Vapor Deposition Create Mystic Topaz and Aqua Aura Quartz?
Vapor deposition can be used to enhance gemstones like topaz and quartz with a metal coating or sheen. Learn how...
Read More
Topaz Buying Guide
Our topaz buying guide can help you learn how topazes are graded, what to avoid, and how to identify a...
Read More
Pyrope Garnet Value, Price, and Jewelry Information
Pyrope always occurs in series with other garnet species. Common, dark red garnets are a mixture of almandine and pyrope....
Read More
What are Gemstone Enhancements?
Gemstone enhancements improve the appearance and wearability of gems. Learn about the most commonly used procedures and frequently treated types...
Read More
Refractive Index List of Common Household Liquids
Gemologists may immerse gems in refraction fluids during examinations. This refractive index list of household liquids offers some common alternatives....
Read More
Tucson Gem and Mineral Show Reviews
Novice and expert gemologists discuss their experiences at the celebrated annual February Tucson Gem and Mineral Show. You'll find reviews...
Read More
How to Clean Your Gemstone Jewelry
A little gemology goes a long way. Learn how to clean your gemstone jewelry safely and how to deal with...
Read More
Pricing Faceted Gems and Calculating Your Return
Properly pricing faceted gems can be a daunting task for investors. Learn how to research gem prices and calculate your...
Read More
Malachite Symbolism
Behind every mystical gem is a merchant. Since ancient times, malachite has been “the salesman's stone.” Learn more about malachite...
Read More
Marketing Your Gems Online
Accurate descriptions and quality photographs are essential for marketing your gems online. Learn about options and best practices for improving...
Read More
A Guide to Gem Selling Platforms
Determining where to sell your gems — whether online or in-person — can be difficult. Here’s a look at the...
Read More
Lapis Lazuli Symbolism
How do you say “love me” with a stone? Learn about lapis lazuli symbolism and legends. This beautiful blue mineral...
Read More
Negotiating Strategies for the Gem Trade
What negotiating strategies work best in the gem trade? Learn how some general principles and a win-win mindset can help...
Read More
How to Prepare for Gemstone Negotiations
Research is crucial for success in any business deal. To prepare for gemstone negotiations, focus on these three subjects to...
Read More
Turquoise Symbolism
Many people consider beautiful sky blue turquoise stones to be lucky. Learn about the turquoise symbolism and lore of Native...
Read More
Negotiations 101: Key Principles for Buying Gems for Profit
Your gem investment profits depend mostly on the prices you set through negotiations. Understanding four key business principles will help...
Read More
Options for Financing Gem Buying for Profit
How should you pay for investment gems? Learn the pros of cons of three options for financing gem investments —...
Read More
How to Establish a Network of Gem Trade Contacts
To make a profit investing in gems, you’ll need a network of gem trade contacts. Here’s some advice on how...
Read More
Gemstone Sourcing Guide
Investors have many gemstone sourcing options, but which ones will work best for you? Learn the pros and cons, as...
Read More
The Impact of Lab-Grown Stones on the Gem Market
Lab-grown stones have the potential to disrupt the gem market. Learn how they can affect supply and demand and whether...
Read More
Topaz Symbolism
Topaz's most popular mystical association has been with wealth. However, topaz symbolism and lore also covers areas such as health,...
Read More
Insights on Gemstone Pricing
Gemstone pricing can vary greatly between dealers. Learn about the myriad factors that go into prices for both colored gems...
Read More
Gemstone Orientation for Beginners
Choosing the best gemstone orientation for your rough takes skill and experience. Learn what factors you should take into account...
Read More
Gemstone Rarity and Ease of Replacement
Most gemstones are rare, but some are rarer than others. Learn how gemstone rarity and ease of replacement can affect...
Read More
Inclusion Management and Gemstone Faceting
Inclusion management is one of the most challenging aspects of gemstone faceting. Learn when to remove and when to keep...
Read More
Supply and Demand: Gemstone Market Dynamics
The gem market can be very subjective. Nevertheless, investors can make money by starting with the basics: understanding supply and...
Read More
What Do the GIA Gem Clarity Grading Codes Mean?
A gemstone’s clarity grade indicates how free it is of inclusions and blemishes. Learn how to decipher the GIA clarity...
Read More
Gemstone Buying for Profit: Budget and Basis
Good-quality gemstones are expensive, but you can make money investing in gems even if you have a small investment budget....
Read More
Managing Your Time Horizon for Gem Buying and Selling
How long should investors hold on to gemstones? Learn how your investment goals, business model, and patience affect your investment...
Read More
Evaluating Market Risk for Gemstones
Gemstone investors must keep up with global trends when evaluating market risk. Learn how studying sociocultural factors can lead to...
Read More
Risk Management and Gem Buying for Profit
You can’t eliminate all risks from gem investing, but understanding the risks you’ll face and your appetite for them will...
Read More
Buying Gems for Profit: An Introduction
Successful investing in gemstones requires knowledge and experience. The IGS Buying Gems for Profit course will give you the knowledge...
Read More
Gem Pricing Advice for Faceters
Gem pricing isn't easy, and guidelines aren't always fixed. Learn what factors gem cutters should consider to determine a fair...
Read More
What is Gemstone Pleochroism?
Some gems show pleochroism, two or three different colors depending on the viewing angle. Learn why this occurs and how...
Read More
How to Re-Oil Emeralds Safely and Easily
Oil treatment is a standard industry practice for enhancing emeralds. However, the treatments are not permanent. Learn how to re-oil...
Read More
Meteorite Jewelry: An Introduction
Meteorites can make beautiful, unique jewelry. This primer on meteorite terminology will help you buy the perfect meteorite jewelry piece...
Read More
What Causes Emerald Fractures?
Emeralds get their green color from chromium and vanadium. Learn how the presence of these elements affects their formation and...
Read More
Emerald Fillers and Treatments
Emerald fillers can improve the beauty of these gems but also have some drawbacks. Learn how to choose the right...
Read More
Ruby Buying Guide – Special Free Preview
Our ruby buying guide can help you learn how rubies are graded, what to avoid, and how to identify a...
Read More
Are White Aquamarines Genuine Aquamarines?
Aquamarine is the blue to blue-green variety of beryl. If you encounter so-called white aquamarines, buyer beware. Learn the facts...
Read More
What is a Trapiche Emerald?
Trapiche emerald gems are some of the world's rarest emeralds. Learn where they're found and how their characteristic “spoked wheel”...
Read More
Is a Lab-Created Emerald a Real Emerald?
What's the difference between a lab-created emerald and a natural emerald? Is a synthetic gem a real gem? Learn the...
Read More
How to Find Curved Striae in Synthetic Ruby and Sapphire
Curved striae or lines are a telltale sign of synthetic ruby and sapphire. If you're having trouble seeing them, here...
Read More
Are Serengeti Rubies Real Rubies?
Although Tanzania is a source of rubies, so-called Serengeti rubies are more likely to be garnets. Learn more about rubies...
Read More
What is the Best Synthetic Corundum?
There are many ways to grow ruby and sapphire in a lab. However, determining the best synthetic corundum for faceting...
Read More
Emerald Symbolism
Emerald symbolism encompasses not only royalty but also wit, eloquence, and foresight. Learn more about the legends surrounding this prized...
Read More
What are the Best Rough Sapphire Stones?
The best rough sapphire stones may come from different sources, depending on the color you want. However, valuable blues may...
Read More
Do Natural Rubies Fluoresce?
Both natural and synthetic rubies fluoresce under UV light. Learn how slight differences in fluorescence patterns can help gemologists distinguish...
Read More
Ruby and Sapphire Origins
Ruby and sapphire origins greatly affect the values of these prized gems. Learn where these stones occur and how inclusions...
Read More
Ruby Symbolism
Many cultures have long considered ruby a king's gem. Not surprisingly, ruby symbolism and lore have many associations with power,...
Read More
What’s the Difference Between Rubies and Pink Sapphires?
How do gemologists distinguish between rubies and pink sapphires? Learn about the chemistry of corundum and the history of the...
Read More
Mimetite Value, Price, and Jewelry Information
Transparent mimetite crystals are extremely rare, and very few have ever been faceted. Cabochons with rich orange and yellow colors...
Read More
Calcareous Concretions Value, Price, and Jewelry Information
Several species of marine mollusks produce stony growths called calcareous concretions or non-nacreous pearls. Varieties such as conch pearls, tridacna...
Read More
What is the Average Gemstone Faceting Yield?
What’s the average gemstone faceting yield from a single piece of rough? Learn how to estimate how much material you’ll...
Read More
Pectolite (Larimar) Value, Price, and Jewelry Information
Fibrous pectolite has long been a curiosity for gem collectors. Compact material can make wonderful cabochons, and transparent crystals are...
Read More
Gem Cutting Acronyms and Their Meanings
You'll find gem cutting acronyms like L/W in faceting guides. Learn what these frequently used terms mean and how they...
Read More
Väyrynenite Value, Price, and Jewelry Information
Väyrynenite is a very rare mineral. Crystals as well as faceted gemstones in reddish, pinkish, and orange colors are prized...
Read More