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

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

Topaz Crystal II (TOPAZ2.JRG)
By Jeff R. Graham
Copyright 1993
74% Light Return
Angles for R.I. = 1.62
53 facets + 8 facets on girdle = 61
2-fold, mirror-image symmetry
96 index
L/W = 1.450 T/W = 1.061 T/L = 0.732
P/W = 0.419 C/W = 0.178
H/W = (P+C)/W+0.02 = 0.616
P/H = 0.680 C/H = 0.288
Vol./W^3 = 0.290

Gram Book 1 – Another design for topaz crystal shapes, Champagne or pinkish (Mexican). No point for cleavage breaks, and close to natural shape for low waste. This design makes a nice cut with good return, 1-6cts. (not easy to do!)

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.