Faceting Design Diagram: Fanned Triangle – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

Fanned Triangle (QTZ40.JRG)
By Jeff R. Graham
Copyright 1994
88.3% Light Return
Angles for R.I. = 1.54
52 facets + 15 facets on girdle = 67
3-fold, mirror-image symmetry
96 index
L/W = 1.028 T/W = 0.303 T/L = 0.295
P/W = 0.392 C/W = 0.213
H/W = (P+C)/W+0.02 = 0.625
P/H = 0.627 C/H = 0.341
Vol./W^3 = 0.211

Addition # 1 – This design is fairly hard to cut and takes some work and attention to detail. Cut in refractive indexes 1.54 to 1.93 with no changes. Light material makes the best stone, 1-12cts.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.