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

Oops a Daisy (DOME20.JRG)
By Jeff R. Graham
Copyright 2007
88% Light Return
Angles for R.I. = 1.62
85 facets + 6 facets on girdle = 91
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.249 T/L = 0.216 P/W = 0.419 C/W = 0.318
H/W = (P+C)/W+0.02 = 0.758 P/H = 0.553 C/H = 0.420
Vol./W^3 = 0.296

Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is fun and pretty fast to cut. It is a good design for light to medium saturated rough and I like it in Tourmaline, but it works well in about any material.

 

 

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