Diamonds & Bonz’s: Faceting Design Diagram
Information and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Diamonds & Bonz's".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Diamonds & Bonz's (CHECK52.JRG)
By Jeff R. Graham
Copyright 2002
90.5% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
2-fold, mirror-image symmetry
96 index
L/W = 1.023 T/W = 0.301 T/L = 0.295
P/W = 0.470 C/W = 0.202
H/W = (P+C)/W+0.02 = 0.692
P/H = 0.679 C/H = 0.292
Vol./W^3 = 0.304
Addition # 8 - Cut this in refractive indexes 1.62 to 1.93 with no changes. This is a little complicated, but not too hard to cut. The crown facets cut fast, especially on a small stone. This works well in about any material.
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.
Related Articles
Tourmaline Value, Price, and Jewelry Information
Emerald Cutting Advice For Green Tourmaline And Rubellite
Blue Tourmaline (Indicolite) Buying Guide
Trapiche Gems: An Introduction
Never Stop Learning
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
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!