Signature #3: Faceting Design Diagram
Helpful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Signature #3"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Signature #3 (B15.JRG)
By Jeff R. Graham
Copyright 2000
89.9% Light Return
Angles for R.I. = 1.62
77 facets + 12 facets on girdle = 89
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.870 T/L = 0.654
P/W = 0.612 C/W = 0.175
H/W = (P+C)/W+0.02 = 0.807
P/H = 0.759 C/H = 0.217
Vol./W^3 = 0.491
Addition # 5 - This is one of my favorite rectangle cushions to cut (that's why it's a Signature cut). It is well worth the trouble. This design is very bright, and I find that it works well in medium colored material. This cuts in R.I. 1.62 to 1.76 (87.5%) with no changes.
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 Gem, Price, and Jewelry Information
Faceting Survey Results – Polishing – Tourmaline
Tourmaline Engagement Rings: the Ultimate Guide
Rubellite Tourmaline Buying Guide
Latest Articles
Table of Refractive Indices and Double Refraction of Selected Gems
Red Gemstones: Ruby, Spinel, Garnet, and Other Great Picks for Jewelry
Jadeite Value, Price, and Jewelry Information
Tips for Cutting and Polishing Halite
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!