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

Trip'in (CHECK70.JRG)
By Jeff R. Graham
Copyright 2003 84.3%
Light return Angles for R.I. = 1.62
39 facets + 4 facets on girdle = 43
2-fold, mirror-image symmetry
96 index
L/W = 1.303 T/W = 0.273 T/L = 0.209
P/W = 0.370 C/W = 0.222
H/W = (P+C)/W+0.02 = 0.612
P/H = 0.604 C/H = 0.363
Vol./W^3 = 0.194

Addition # 8 - This needs to be cut in a large stone and can be cut in another order. Notice that I cut the center first and go towards the edges. This is because there are no critical meets at 96-48 and these facets can absorb any slack that you might have. Also this can be cut in variable L/W, just let the outside facets absorb the difference by being larger or smaller. This can be cut in Quartz with no changes 81.2% to 2.14 (85.3%).

 

 

 

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