Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Glitter Squared #2 (MC106.JRG)
By Jeff R. Graham
Copyright 2006
90% Light Return
Angles for R.I. = 1.62
121 facets + 4 facets on girdle = 125
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.418 T/L = 0.418 P/W = 0.620
C/W = 0.231 H/W = (P+C)/W+0.02 = 0.871 P/H = 0.712 C/H = 0.265 Vol./W^3 = 0.443
PAVILION
CROWN
Addition # 12 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is designed to be a large stone and it works well in light to medium saturations. This is not hard to cut, but does takes some experience.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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