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

Crystal Trig Glitter (MC111.JRG)
By Jeff R. Graham
Copyright 2006
84% Light Return
Angles for R.I. = 1.62
76 facets + 6 facets on girdle = 82
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.364 T/L = 0.339 P/W = 0.478
C/W = 0.246 H/W = (P+C)/W+0.02 = 0.744 P/H = 0.643 C/H = 0.330 Vol./W^3 = 0.277

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. I designed this Trig variation for Aquamarine or any light to medium saturated material. This works in Quartz (41 degrees) although the performance is a little lower (74.8%). Note: C2 tier only meets the girdle at the corners, cutting the tier center point is the easiest way to have even facets.

 

 

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