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


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

Starlight (CHECK37.JRG) Umbalite Garnet cut by Tony Carson
By Jeff R. Graham
Copyright 2001
87.9% Light Return
Angles for R.I. = 1.54
41 facets + 12 facets on girdle = 53
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.351 T/L = 0.351
P/W = 0.443 C/W = 0.173
H/W = (P+C)/W+0.02 = 0.636
P/H = 0.697 C/H = 0.272 Vol./W^3 = 0.208

Addition # 6 – Cut this in refractive indexes 1.54 to 1.93 with no changes. I originally designed this for Garnets, it works well in saturated materials.


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.