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


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

Light Star (QTZ18.JRG)
By Jeff R. Graham
Copyright 1993
63.5% Light Return
Angles for R.I. = 1.54
169 facets + 16 facets on girdle = 185
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.472 T/L = 0.472
P/W = 0.449 C/W = 0.192
H/W = (P+C)/W+0.02 = 0.661
P/H = 0.679 C/H = 0.291
Vol./W^3 = 0.226

Addition # 1 – This design has a nice light return, higher than the 63%. Light lost is around the girdle C1 facets, because of the depth of the stone. Cut in refractive indexes with no changes 1.54 to 1.93 (87.7%) and in a larger sized stone.


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.