Faceting Design Diagram: Prop Square – Topaz – Swiss, Electric, London Blue, Imperial, White, Yellow, Pink, Purple, Champange


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

Prop Square (TOPAZ11.JRG)
By Jeff R. Graham
Copyright 1998
75.5% Light Return
Angles for R.I. = 1.62
53 facets + 4 facets on girdle = 57
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.589 T/L = 0.589
P/W = 0.550 C/W = 0.246
H/W = (P+C)/W+0.02 = 0.816
P/H = 0.674 C/H = 0.302
Vol./W^3 = 0.389

Addition # 2 – This is a nice cut, I like it in Tourmaline. The P6 facets are cut in until they look right, no meet. I like this pattern in a medium color material and around 2cts+. Cut in refractive indexes 1.62 to 1.93 (85.5%) 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.