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

"B" Oval (B6.JRG)
By Jeff R. Graham
Copyright 1999
80% Light Return
Angles for R.I. = 1.62
81 facets + 16 facets on girdle = 97
2-fold, mirror-image symmetry
96 index
L/W = 1.303 T/W = 0.762 T/L = 0.585
P/W = 0.588 C/W = 0.199
H/W = (P+C)/W+0.02 = 0.807
P/H = 0.728 C/H = 0.247
Vol./W^3 = 0.402

Addition # 5 - The breaks are high, but this should be easy to set on the short ends. Cut to center point, then girdle to meet P1, then breaks. Cut in R.I 1.62 to 1.76 (89.4%) with no changes, light material is best.

 

 

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