Temple Glass Triangle: Faceting Design Diagram

Details and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Temple Glass Triangle".


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

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.

Never Stop Learning

When you join the IGS community, you get trusted diamond & gemstone information when you need it.

Become a Member

Get Gemology Insights

Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!