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

Thunder Dancer (MIR42.JRG)
By Jeff R. Graham
Copyright 2004
89.1% Light Return
Angles for R.I. = 1.62
40 facets + 9 facets on girdle = 49
3-fold, mirror-image symmetry
96 index
L/W = 1.009 T/W = 0.134 T/L = 0.133
P/W = 0.374 C/W = 0.188
H/W = (P+C)/W+0.02 = 0.582
P/H = 0.643 C/H = 0.323
Vol./W^3 = 0.176

Addition # 9 - This is unique and is best cut in a large stone so that the dancer can be seen. Cut in refractive indexes 1.62 to 2.14 with no changes. This is nice in about any color saturation. The C1,C2 border is used to frame the dancer, it can be varied. Hint: C6 is a triangular shaped step and you may need to adjust it to get the dancer to look right. Cut it in a little short first then cut the rest of the crown. Adjust until the dancer looks correct.

 

 

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