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

Deep "D" (TOPAZ10.JRG)
By Jeff R. Graham
Copyright 1998
81% Light Return
Angles for R.I. = 1.62
65 facets + 12 facets on girdle = 77
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.561 T/L = 0.561
P/W = 0.516 C/W = 0.241
H/W = (P+C)/W+0.02 = 0.778
P/H = 0.664 C/H = 0.310
Vol./W^3 = 0.369

Addition # 2 - A preform is a good idea. The P3(G) girdle facets should be about 50% in length of a P2(G) facet. These are floated in and have no real meets. It's a little tricky to cut, the depth improves color & dispersion, 1ct+. Cut in refractive indexes 1.62 to 1.93 with no changes.

 

 

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