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

Styled "X" (TLINE31.JRG)
By Jeff R. Graham
Copyright 1995
75% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.869 T/L = 0.653
P/W = 0.479 C/W = 0.220
H/W = (P+C)/W+0.02 = 0.719
P/H = 0.666 C/H = 0.306
Vol./W^3 = 0.442

Addition # 2 - Roughing in the table before cutting the C7 facets helps when cutting. The girdle and P1-P8 can be cut in another order(Preform) if you want. The reflection is higher than it ray traced, light to med material, 1- 12cts. Cut in refractive indexes 1.62 to 1.76 with no changes.

 

 

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