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
80.3% Light Return
Angles for R.I. = 1.62
73 facets + 27 facets on girdle = 100
3-fold, mirror-image symmetry
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
Tourmaline Value, Price, and Jewelry Information
Mint Tourmalines: Gemstones for Our Times
Tourmaline Engagement Ring Stones: the Ultimate Guide
How Do Tourmalines Form?
Creating Ring Mountings for Deep-Cut Gemstones
How Does Topaz Form?
Prosopite Value, Price, and Jewelry Information
Gemstone Doublets, Triplets, and Other Assembled Stones
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
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!