Signature #6: Faceting Design Diagram
Helpful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Signature #6"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Signature #6 (CHECK5.JRG)
By Jeff R. Graham
86.4% Light Return
Angles for R.I. = 1.62
48 facets + 18 facets on girdle = 66
2-fold, mirror-image symmetry
L/W = 1.304 P/W = 0.518 C/W = 0.292
H/W = (P+C)/W+0.02 = 0.830
P/H = 0.624 C/H = 0.352
Vol./W^3 = 0.402
Addition # 6 - This is not easy to cut, but it makes a very nice stone and works well in darker materials. This top will take some cheating to get it lined up which is normal for checkers. This works in refractive indexes 1.62 to 1.93 with no changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Jeff R. Graham
The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.
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