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

Darhla (MIR76.JRG)
By Jeff R. Graham
Copyright 2005
91.4% Light Return
Angles for R.I. = 1.62
41 facets + 10 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.287 T/L = 0.273 P/W = 0.433 C/W = 0.238
H/W = (P+C)/W+0.02 = 0.691 P/H = 0.627 C/H = 0.344
Vol./W^3 = 0.217

Addition # 10 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is very nice and works well in about any saturation. I tend to prefer light to medium saturated stones and I like it in Tourmaline. It is a great Topaz cut.

 

 

 

 

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