Faceting Design Diagram: Deep “D” – Topaz – Swiss, Electric, London Blue, Imperial, White, Yellow, Pink, Purple, Champange


Topaz (Swiss, Electric, London Blue, Imperial, White, Yellow, Pink, Champange)

Deep “D” (TOPAZ10.JRG)
By Jeff R. Graham
Copyright 1998
81% Light Return
Angles for R.I. = 1.62
65 facets + 12 facets on girdle = 77
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.561 T/L = 0.561
P/W = 0.516 C/W = 0.241
H/W = (P+C)/W+0.02 = 0.778
P/H = 0.664 C/H = 0.310
Vol./W^3 = 0.369

Addition # 2 – A preform is a good idea. The P3(G) girdle facets should be about 50% in length of a P2(G) facet. These are floated in and have no real meets. It’s a little tricky to cut, the depth improves color & dispersion, 1ct+. Cut in refractive indexes 1.62 to 1.93 with no changes.


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.