Tour/Top RB: Faceting Design Diagram
Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Tour/Top RB".0
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Tour/Top RB (TLINE58.JRG)
By Jeff R. Graham
82% Light Return
Angles for R.I. = 1.62
73 facets + 16 facets on girdle = 89
8-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.482 T/L = 0.482
P/W = 0.430 C/W = 0.187
H/W = (P+C)/W+0.02 = 0.637
P/H = 0.675 C/H = 0.293
Vol./W^3 = 0.213
Addition # 3 - This is a pretty standard round brilliant, I cut this design quite a bit and think it is still one of the best. A lot of people have asked me for more "RB" designs so here is a good one. Cut in refractive indexes 1.62 to 2.14 (92.8%) 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?
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!