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

Topaz Crystal III (TOPAZ6.JRG)
By Jeff R. Graham
Copyright 1993
70% Light Return
Angles for R.I. = 1.62
87 facets + 16 facets on girdle = 103
2-fold, mirror-image symmetry
96 index
L/W = 1.428 T/W = 0.876 T/L = 0.613
P/W = 0.477 C/W = 0.213
H/W = (P+C)/W+0.02 = 0.710
P/H = 0.672 C/H = 0.300
Vol./W^3 = 0.369

Addition # 2 - This design makes a good large oval in any material, but it is not easy to cut. But if you like ovals, it has nice flash and light return. The cutting will keep you out of trouble for quite a while, 4-18cts.

 

 

 

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