Faceting Design Diagram: Temple Glass Triangle – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Temple Glass Triangle (TLINE6.JRG)
By Jeff R. Graham
Copyright 1993
80.3% Light Return
Angles for R.I. = 1.62
73 facets + 27 facets on girdle = 100
3-fold, mirror-image symmetry
96 index
L/W = 1.005 T/W = 0.488 T/L = 0.486
P/W = 0.382 C/W = 0.169
H/W = (P+C)/W+0.02 = 0.571
P/H = 0.669 C/H = 0.295
Vol./W^3 = 0.189

Addition # 1 – Here is something different! The pavilion facets P10 go through the girdle which is something unusual. It was a look I tried to get for this stone, it is not easy to cut. Cut in refractive indexes 1.62 to 1.93 (80%) with no changes. Light to medium-dark material and works well in Topaz, 1-18cts.

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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