Coping “X”: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Coping "X""
Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)
Coping "X" (CHECK59.JRG)
By Jeff R. Graham
Copyright 2003
89.7% Light Return
Angles for R.I. = 1.54
77 facets + 8 facets on girdle = 85
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.239 T/L = 0.239
P/W = 0.460 C/W = 0.216
H/W = (P+C)/W+0.02 = 0.695
P/H = 0.661 C/H = 0.310
Vol./W^3 = 0.294
Addition # 8 - This cuts pretty easy… The P3 can be varied, but cut P3 as straight, like an "x", as you can. C4 just cuts in to look right and can be varied. This works well in about any material, refractive indexes 1.54 to 2.14 with no changes. This is designed for a large stone…
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Jeff R. Graham
The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.
Related Articles
Rose Quartz Value, Price, and Jewelry Information
Ametrine Value, Price, and Jewelry Information
Amethyst Value, Price, and Jewelry Information
Citrine Value, Price, and Jewelry Information
Latest Articles
Precision Faceting a Story Gemstone: Choosing Rough
32 Green Gemstones (How Many Do You Know?)
A Guide to Antique Georgian Jewelry
Hambergite Value, Price, and Jewelry Information
Never Stop Learning
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get Gemology Insights
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!