Half High: Faceting Design Diagram

Cubic Zirconia

Half High (CZ12.GEM)
By Jeff R. Graham
Copyright 1995
76.3% Light Return
Angles for R.I. = 2.20
67 facets + 12 facets on girdle = 79
3-fold, mirror-image symmetry
96 index
L/W = 1.036 T/W = 0.338 T/L = 0.326
P/W = 0.419 C/W = 0.225
H/W = (P+C)/W+0.02 = 0.663
P/H = 0.631 C/H = 0.339
Vol./W^3 = 0.254

Gram Book 1 - This is not as hard as it looks. C1,C2 are mostly the same settings (C4,C5 too) just meet them evenly. The rest is almost all center point, except for C7, 1-12cts.

Random - Cosine - ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler