Tangier: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Tangier".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Tangier (DOME31.JRG)
By Jeff R. Graham
Copyright 2007
85.6% Light Return
Angles for R.I. = 1.62
67 facets + 6 facets on girdle = 73
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.226 T/L = 0.196 P/W = 0.419 C/W = 0.410
H/W = (P+C)/W+0.02 = 0.849 P/H = 0.494 C/H = 0.483
Vol./W^3 = 0.353
PAVILION
CROWN
Addition # 13 - Cut this in refractive indexes 1.62 to 2.14 with no changes. This is designed for light to mediumly saturated material and is not hard to cut. This cuts a very bright stone with a lot of sparkle.
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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