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

Mig (TOPAZ20.JRG)
By Jeff R. Graham
Copyright 1998
78% Light Return
Angles for R.I. = 1.62
76 facets + 12 facets on girdle = 88
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.577 T/L = 0.537
P/W = 0.468 C/W = 0.188
H/W = (P+C)/W+0.02 = 0.677
P/H = 0.692 C/H = 0.278
Vol./W^3 = 0.245

Addition # 3 - This can be hard to follow because of the sym changes. Once you cut one, it's not very hard. This design has a very unusual look to it, I like it in Topaz. Cut in any material, 2-18cts. Cut in refractive indexes 1.62 to 2.14 (84.1) with no changes.

 

 

 

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