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

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

Topaz Crystal I (TOPAZ1.JRG)
By Jeff R. Graham
Copyright 1993
84.8% Light Return
Angles for R.I. = 1.62
49 facets + 10 facets on girdle = 59
2-fold, mirror-image symmetry
96 index
L/W = 1.125 T/W = 0.584 T/L = 0.519
P/W = 0.409 C/W = 0.214
H/W = (P+C)/W+0.02 = 0.643
P/H = 0.635 C/H = 0.333
Vol./W^3 = 0.243

Gram Book 1 – I bought a large amount of topaz recently, when I went to cut some of it the crystals had this shape to them. I needed a design for them (low waste) that has good return and easy to cut(59 Facets), any material, 1- 6cts. Cut in refractive index 1.62 to 1.76 (84.8%) 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.