Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Jerico (MIR57.JRG)
By Jeff R. Graham
Copyright 2005
89.3% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.250 T/L = 0.250 P/W = 0.466
C/W = 0.205 H/W = (P+C)/W+0.02 = 0.692 P/H = 0.674 C/H = 0.297 Vol./W^3 = 0.259
PAVILION
CROWN
Addition # 10 – Cut in refractive indexes 1.62 to 1.93 with no changes. This has a lot of reflections in it and works best in a large stone with light saturation. This is quick and easy to cut. It is great for large earrings.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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