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

Stained Round (TLINE2.JRG)
By Jeff R. Graham
Copyright 1993
82% Light Return
Angles for R.I. = 1.62
73 facets + 16 facets on girdle = 89
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.223 T/L = 0.223
P/W = 0.424 C/W = 0.208
H/W = (P+C)/W+0.02 = 0.653
P/H = 0.650 C/H = 0.319
Vol./W^3 = 0.208

Addition # 1 - This design is not hard to cut, but attention must be paid to the meet P2(G),C3 facets. It reminds me of stained glass because of the overall look of the stone. Cut in refractive indexes 1.62 to 1.93 with no changes. Cut in light to medium material, any size.

 

 

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