Est #1: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Est #1".0
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Est #1 (TLINE51.JRG)
By Jeff R. Graham
81% Light Return
Angles for R.I. = 1.62
29 facets + 4 facets on girdle = 33
2-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.444 T/L = 0.444
P/W = 0.495 C/W = 0.139
H/W = (P+C)/W+0.02 = 0.654
P/H = 0.757 C/H = 0.212
Vol./W^3 = 0.336
Addition # 3 - This cuts like a pretty standard step cut. The only different thing about it is the high light return. Try it in a good med color tourmaline of about any color, 1-18cts. Can be cut as a rectangle any L/W, put the "c" axis on Tourmaline on the steep ends... Cut in refractive indexes 1.62 to 2.14 with no changes.
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?
Lapidary Technology Through the Ages: Laps and Polish
Why are Topaz and Citrine Gemstones Misidentified?
Identifying Garnets Simplified
Staurolite Value, Price, and Jewelry Information
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!