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

Apature (DOME25.JRG)
By Jeff R. Graham
Copyright 2007
84% Light Return
Angles for R.I. = 1.62
161 facets + 16 facets on girdle = 177
16-fold symmetry
96 index
L/W = 1.000 T/W = 0.250 T/L = 0.250 P/W = 0.405 C/W = 0.361
H/W = (P+C)/W+0.02 = 0.786 P/H = 0.515 C/H = 0.460
Vol./W^3 = 0.275

Addition # 13 - Cut this in refractive indexes 1.62 to 2.14 with no changes. This is designed for a large stone and light saturation. It is not hard to cut and is very interesting.

 

 

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