Flutter: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Flutter".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
By Jeff R. Graham
81.5% Light Return
Angles for R.I. = 1.62
35 facets + 12 facets on girdle = 47
2-fold, mirror-image symmetry
L/W = 1.200 T/W = 0.349 T/L = 0.291
P/W = 0.436 C/W = 0.230
H/W = (P+C)/W+0.02 = 0.686
P/H = 0.636 C/H = 0.335
Vol./W^3 = 0.234
Addition # 8 - Cut in refractive indexes 1.62 to 2.14 (86.4%) with no changes. This cuts easily with no real surprises.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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