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

Piller (B29.JRG)
By Jeff R. Graham
Copyright 2001
82.7% Light Return
Angles for R.I. = 1.62
55 facets + 8 facets on girdle = 63
2-fold, mirror-image symmetry
96 index
L/W = 1.228 T/W = 0.830 T/L = 0.676
P/W = 0.539 C/W = 0.166
H/W = (P+C)/W+0.02 = 0.726
P/H = 0.743 C/H = 0.229
Vol./W^3 = 0.316

Addition # 5 - Notice that the C2 on the crown is left for taking up slack if your L/W is slightly off. This can be cut in almost any R.I. with no changes (88.2% in 1.76). It’s fast to cut and nice in almost any good colored material.

 

 

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