Faceting Design Diagram: “S” Hex – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

“S” Hex (TLINE10.JRG) 2.40 carat champange Tourmaline
By Jeff R. Graham
Copyright 1994
83.2% 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 = 0.589 T/L = 0.510
P/W = 0.430 C/W = 0.196
H/W = (P+C)/W+0.02 = 0.647
P/H = 0.665 C/H = 0.304
Vol./W^3 = 0.251

Gram Book 1 – A fairly standard hex to cut, it has a very nice-star-in-a-star flash and a good light return. Any material in light to medium color is good, I cut this quite often, because Tourmaline crystals are often this shape. Cut in refractive index 1.62 to 2.14 (84.8%) with no changes.

 

 


Random – Cosine – ISO

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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