Diamond Back: Faceting Design Diagram
Detailed information and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Diamond Back"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Diamond Back (CHECK72.JRG)
By Jeff R. Graham
81.5% Light Return
Angles for R.I. = 1.62
27 facets + 6 facets on girdle = 33
2-fold, mirror-image symmetry
L/W = 1.33 T/W = 0.590 T/L = 0.457
P/W = 0.418 C/W = 0.146
H/W = (P+C)/W+0.02 = 0.584
P/H = 0.716 C/H = 0.250
Vol./W^3 = 0.217
Addition # 8 - Cut in refractive indexes 1.54 (78.4%) to 2.14 with no changes. This is a neat one, named after a local varmit we have in Tucson in the summer- time (rattlesnakes). This cuts fast and is good in about any material. The L/W on this can vary a bit with no problem.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
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