Liner: Faceting Design Diagram
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
By Jeff R. Graham
88.8% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
2-fold, mirror-image symmetry
L/W = 1.330 T/W = 0.961 T/L = 0.722
P/W = 0.572 C/W = 0.160
H/W = (P+C)/W+0.02 = 0.752
P/H = 0.760 C/H = 0.213
Vol./W^3 = 0.402
Addition # 5 - This is a "Money Cut"... It's fast to cut with a low number of facets and high performance. This can be cut in R.I. 1.62 to 1.93 with no changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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