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


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

Pure Jeff Graham Facet Design 1

Pure Jeff Graham Facet Design 3

 

 

Pure  (DOME1.JRG)Tourmaline
By Jeff R. Graham
Copyright 1999
79.6% Light Return
Angles for R.I. = 1.62
49 facets + 6 facets on girdle = 55
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.409 T/L = 0.354 P/W = 0.435
C/W = 0.392 H/W = (P+C)/W+0.02 = 0.847 P/H = 0.513 C/H = 0.463 Vol./W^3 = 0.362

Addition # 13 – This is designed for light colored material, pale pink is nice. It is easy to cut and has a nice flash pattern. Cut in refractive indexes 1.62 to 2.14 with no changes. This is quick to cut and is ideal for Tourmaline nodules.

Pure Jeff Graham Facet Design2

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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