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

"S" Hex +2 (TOPAZ13.JRG)
By Jeff R. Graham
Copyright 1998
86% Light Return
Angles for R.I. = 1.62
47 facets + 8 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.200 T/W = 0.738 T/L = 0.615
P/W = 0.463 C/W = 0.185
H/W = (P+C)/W+0.02 = 0.668
P/H = 0.693 C/H = 0.277
Vol./W^3 = 0.319

Addition # 2 - Cutting in the table before the C7 facets is easier. A preform is a good idea also. This is medium hard to cut, after you have cut it once it gets easy. Any good material, 1-14cts. Cut in refractive indexes 1.62 to 1.93 with no changes.

 

 

 

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