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


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

“DC” Mark (TOPAZ14.JRG)
By Jeff R. Graham
Copyright 1998
75.5% Light Return
Angles for R.I. = 1.62
67 facets + 12 facets on girdle = 79
2-fold, mirror-image symmetry
96 index
L/W = 1.500 T/W = 0.731 T/L = 0.487
P/W = 0.434 C/W = 0.240
H/W = (P+C)/W+0.02 = 0.694
P/H = 0.625 C/H = 0.346
Vol./W^3 = 0.338

Addition # 3 – This stone has almost no light lost through the bottom. It is deep for lighter material, and has great sparkle. This is a non standard L/W and might take a custom head It cuts well in any medium light material, 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.