Coping “X”: Faceting Design Diagram

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

Coping "X" (CHECK59.JRG)
By Jeff R. Graham
Copyright 2003
89.7% Light Return
Angles for R.I. = 1.54
77 facets + 8 facets on girdle = 85
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.239 T/L = 0.239
P/W = 0.460 C/W = 0.216
H/W = (P+C)/W+0.02 = 0.695
P/H = 0.661 C/H = 0.310
Vol./W^3 = 0.294

Addition # 8 - This cuts pretty easy… The P3 can be varied, but cut P3 as straight, like an "x", as you can. C4 just cuts in to look right and can be varied. This works well in about any material, refractive indexes 1.54 to 2.14 with no changes. This is designed for a large stone…

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler