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

Angular Dreams (MIR38.JRG)
By Jeff R. Graham
Copyright 2004
90.0% Light Return
Angles for R.I. = 1.62
40 facets + 6 facets on girdle = 46
3-fold, mirror-image symmetry
72 index
L/W = 1.099 T/W = 0.320 T/L = 0.291
P/W = 0.408 C/W = 0.186
H/W = (P+C)/W+0.02 = 0.615
P/H = 0.664 C/H = 0.303
Vol./W^3 = 0.201

Addition # 9 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is a killer, try it in any material. I designed it for Tourmaline, and it is great in Topaz too. It also makes a nice Garnet cut.

 

 

 

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