Faceting Design Diagram: Half High – Cubic Zirconia


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

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.