Step'in Four: Faceting Design Diagram

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

Step'in Four (MIR81.JRG)
By Jeff R. Graham
Copyright 2005
87.4% Light Return
Angles for R.I. = 1.62
25 facets + 8 facets on girdle = 33
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.257 T/L = 0.257 P/W = 0.466
C/W = 0.182 H/W = (P+C)/W+0.02 = 0.668 P/H = 0.698 C/H = 0.272 Vol./W^3 = 0.252

PAVILION

CROWN

Addition # 10 - Cut in refractive indexes 1.62 to 1.76 with no changes. This works well in light to medium saturations. I use it for Garnets, particularly for earrings. It's pretty fast and easy to cut. The reflections will surprise you.

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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