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

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.