Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Tour/Top RB (TLINE58.JRG)
By Jeff R. Graham
Copyright 1998
82% Light Return
Angles for R.I. = 1.62
73 facets + 16 facets on girdle = 89
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.482 T/L = 0.482
P/W = 0.430 C/W = 0.187
H/W = (P+C)/W+0.02 = 0.637
P/H = 0.675 C/H = 0.293
Vol./W^3 = 0.213

Addition # 3 - This is a pretty standard round brilliant, I cut this design quite a bit and think it is still one of the best. A lot of people have asked me for more "RB" designs so here is a good one. Cut in refractive indexes 1.62 to 2.14 (92.8%) with no changes.

 

 

 

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