Faceting Design Diagram: 6-Star – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

6-Star (QTZ11.JRG)
By Jeff R. Graham
Copyright 1993
72% Light Return
Angles for R.I. = 1.54
79 facets + 12 facets on girdle = 91
6-fold, mirror-image symmetry
96 index
L/W = 1.036 T/W = 0.474 T/L = 0.457
P/W = 0.462 C/W = 0.209
H/W = (P+C)/W+0.02 = 0.691
P/H = 0.668 C/H = 0.303
Vol./W^3 = 0.254

Addition # 1 – This design has a lot of sparkle and flash that looks a lot like a star in a star. It makes a nice stone in any size, light to medium-dark material. The ray trace is misleading, the only light loss is around the C1 facets, 1ct+. Cut in refractive indexes 1.54 to 1.93(84.9%) wit no changes.


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.