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

Spiro (MC61.JRG)
By Jeff R. Graham
Copyright 2002
86.9% Light Return
Angles for R.I. = 1.54
46 facets + 12 facets on girdle = 58
3-fold, mirror-image symmetry
96 index
L/W = 1.075 T/W = 0.384 T/L = 0.357
P/W = 0.441 C/W = 0.193
H/W = (P+C)/W+0.02 = 0.654
P/H = 0.674 C/H = 0.295
Vol./W^3 = 0.239

Addition # 7 - This is designed for medium saturated material, cut in refractive indexes 1.54 to 2.20 with no changes. This design is for rough that is not quite round but not quite triangular, I seem to get a lot of rough this shape.

 

 

 

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