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

Blue Daisy (TOPAZ4.JRG)
By Jeff R. Graham
Copyright 1993
83.4% Light Return
Angles for R.I. = 1.62
97 facets + 8 facets on girdle = 105
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.483 T/L = 0.483
P/W = 0.438 C/W = 0.184
H/W = (P+C)/W+0.02 = 0.643
P/H = 0.682 C/H = 0.287
Vol./W^3 = 0.233

Gram Book 1 - This design is very different, but it cuts easy once you get going. It is a mixed cut and the steps on the top and bottom should be the same. I like this cut in blue material, 1-12cts. Cut in refractive index 1.62 to 2.14 (91%) with no changes.

 

 

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