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

Little Mick (B17.JRG)
By Jeff R. Graham
Copyright 2001
88.6% Light Return
Angles for R.I. = 1.62
61 facets + 16 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.172 T/W = 0.645 T/L = 0.550
P/W = 0.499 C/W = 0.203
H/W = (P+C)/W+0.02 = 0.722
P/H = 0.691 C/H = 0.281
Vol./W^3 = 0.307

Addition # 5 - This is a very low L/W oval and is designed to be cut in small material, but works well in any size. I often need a design like this for a quick oval in nodule shaped Tourmaline. This works in R.I. 1.62 to 1.93 (91.5%) with no changes.

 

 

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