Tourmaline 20: Faceting Design Diagram
Successful tips,details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Tourmaline"0
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Tourmaline 20 (MC32.JRG)
By Jeff R. Graham
83.6% Light Return
Angles for R.I. = 1.62
43 facets + 8 facets on girdle = 51
2-fold, mirror-image symmetry
L/W = 2.000 T/W = 1.354 T/L = 0.677
P/W = 0.493 C/W = 0.181
H/W = (P+C)/W+0.02 = 0.694
P/H = 0.710 C/H = 0.261
Vol./W^3 = 0.744
Addition # 4 - If you are cutting in Tourmaline, be sure that the "c" axis is close in color to the a/b or this design will get muddy. The keel on this is harder than it looks, it works well in Topaz, 1-12cts. Cut this in R.I. 1.62 to 1.76 (82.4%) without 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?
Why are Topaz and Citrine Gemstones Misidentified?
Identifying Garnets Simplified
Staurolite Value, Price, and Jewelry Information
Amethyst Buying Guide
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!