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

133 Oval (B2.JRG)
By Jeff R. Graham
Copyright 2001
88.8% Light Return
Angles for R.I. = 1.62
65 facets + 12 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.845 T/L = 0.635
P/W = 0.569 C/W = 0.193
H/W = (P+C)/W+0.02 = 0.781
P/H = 0.728 C/H = 0.247
Vol./W^3 = 0.414

Addition # 5 - This is nice and works well in R.I. 1.62-1.93 with no changes. This is a good basic standard oval Barion, with a lot of performance. The number of facets is fairly low and this cuts pretty fast.

 

 

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