Circle: 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 "Circle".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Circle (DOME36.JRG)
By Jeff R. Graham
Copyright 2007
75.7% Light Return
Angles for R.I. = 1.62
73 facets + 8 facets on girdle = 81
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.211 T/L = 0.211 P/W = 0.438 C/W = 0.401
H/W = (P+C)/W+0.02 = 0.859 P/H = 0.510 C/H = 0.467
Vol./W^3 = 0.323
PAVILION
CROWN
Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed to help improve lightly saturated rough. I designed it for Afghan Tourmaline nodules, but it works well in any pale to light saturated rough.
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.
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