crystal tourmaline designcrystal tourmaline design

Crystal Tourmaline: Faceting Design Diagram

Tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Crystal Tourmaline".


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

crystal tourmaline design

Crystal Tourmaline (TLINE8.JRG)
By Jeff R. Graham
Copyright 1994
81.0% Light Return
Angles for R.I. = 1.62
43 facets + 9 facets on girdle = 52
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.467 T/L = 0.435
P/W = 0.441 C/W = 0.177
H/W = (P+C)/W+0.02 = 0.638
P/H = 0.692 C/H = 0.277
Vol./W^3 = 0.241

Gram Book 1 - This design is a nice one. It works great for material that has this shape on the "C" axis. It should be cut in a little larger size, and any color that has good light through the "C", 1-6cts. This works very well cut in the Nigerian pink Tourmaline. Cut in refractive index 1.62 to 1.93 (83.6%) with no changes.



Random - Cosine - ISO

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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