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

Sparkles (B24.JRG)
By Jeff R. Graham
Copyright 2001
87.1% Light Return
Angles for R.I. = 1.62
85 facets + 6 facets on girdle = 91
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.448 T/L = 0.388
P/W = 0.488 C/W = 0.256
H/W = (P+C)/W+0.02 = 0.764
P/H = 0.639 C/H = 0.335
Vol./W^3 = 0.336

Addition # 5 - This needs to be cut in light material to get the best effect. It has a lot of life and works very well in Danburite. The crown can be hard to cut on a smaller stone because there are a lot of facets that need to meet. This works in R.I. 1.62 to 1.93 (87.5%) with no changes.

 

 

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