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

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

Mask Rectangle (QTZ43.JRG)
By Jeff R. Graham
Copyright 1995
70% Light Return
Angles for R.I. = 1.54
61 facets + 12 facets on girdle = 73
2-fold, mirror-image symmetry
96 index L/W = 1.402
T/W = 0.900 T/L = 0.642
P/W = 0.596 C/W = 0.259
H/W = (P+C)/W+0.02 = 0.875
P/H = 0.681 C/H = 0.296
Vol./W^3 = 0.545

Gram Book 1 – The P10,P11,P12 facets can be cut in another order if you want. I thought this would work best, because once the girdle is cut the others meet it and can be cheated, so long as they are even… This is a hard one to cut the first couple of times, once you get it, it’s easier. This works in Tourmaline and Topaz. Not for the novice…

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.