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

Deeply Aqua (TOPAZ7.JRG)
By Jeff R. Graham
Copyright 1993
82.6% light return
Angles for R.I. = 1.62
81 facets + 12 facets on girdle = 93
2-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.503 T/L = 0.503
P/W = 0.556 C/W = 0.253
H/W = (P+C)/W+0.02 = 0.829
P/H = 0.671 C/H = 0.305
Vol./W^3 = 0.362

Addition # 3 - This design should be cut as a preform to save waste, but it could be cut to center point. I designed this stone for some very light topaz I bought. It is made to be deep to help the color, 1-12cts. Cut in refractive indexes 1.62 to 1.93 (83.7%) with no changes.

 

 

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