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.

 

 

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