Mask Rectangle: Faceting Design Diagram

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