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

Angel Fire (B33.JRG)
By Jeff R. Graham
Copyright 2001
87.7% Light Return
Angles for R.I. = 1.62
61 facets + 8 facets on girdle = 69
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.527 T/L = 0.527
P/W = 0.497 C/W = 0.183
H/W = (P+C)/W+0.02 = 0.700
P/H = 0.711 C/H = 0.261
Vol./W^3 = 0.292

Addition # 5 - This cuts fast and is very bright. It works well in R.I. 1.62 to 1.93 with no changes. It should be cut in a decent sized stone because the crown facets are fairly small.

 

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