Faceting Design Diagram: Lens – Tourmaline, Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Lens Jeff Graham Facet Design 1 Lens Jeff Graham Facet Design 2

Lens (DOME4.JRG)
By Jeff R. Graham
Copyright 2007
80.6% Light Return
Angles for R.I. = 1.62
133 facets + 12 facets on girdle = 145
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.294 T/L = 0.294 P/W = 0.419
C/W = 0.295 H/W = (P+C)/W+0.02 = 0.734 P/H = 0.571 C/H = 0.402 Vol./W^3 = 0.277

Addition # 13 – Cut this in refractive indexes 1.62 to 2.14 with no changes. This is an interesting cut and works well in any light to medium saturated material. This is not hard to cut.

Lens Jeff Graham Facet Design 3

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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