Step’in “C”: 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 "Step'in C"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Step'in "C" (MIR77.JRG)
By Jeff R. Graham
88.8% Light Return
Angles for R.I. = 1.62
29 facets + 8 facets on girdle = 37
2-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.257 T/L = 0.257 P/W = 0.438
C/W = 0.229 H/W = (P+C)/W+0.02 = 0.687 P/H = 0.637 C/H = 0.334 Vol./W^3 = 0.320
Addition # 10 - Cut in refractive indexes 1.62 to 1.76 with no changes. This is designed for dark axis "c" Tourmaline. It is easy to cut and works well. It has step/checker reflection. The crown can be lowered to 30 degrees for very dark material.
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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