Faceting Design Diagram: Signature #6 – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Signature #6 (CHECK5.JRG)5.18 Rose Malaya Garnet
By Jeff R. Graham
Copyright 2000
86.4% Light Return
Angles for R.I. = 1.62
48 facets + 18 facets on girdle = 66
2-fold, mirror-image symmetry
96 index
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

About the author
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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