Glow: 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 "Glow-Tourmaline".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Glow (MIR27.JRG)
By Jeff R. Graham
Copyright 2004
91.5% Light Return
Angles for R.I. = 1.62
46 facets + 5 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.172 T/L = 0.164
P/W = 0.382 C/W = 0.246
H/W = (P+C)/W+0.02 = 0.648
P/H = 0.589 C/H = 0.380
Vol./W^3 = 0.196
Addition # 9 - This is designed for lightly saturated materials like Tourmaline and Aquamarine. Try this in a light Tourmaline nodule, it is a real sparkler. Cut in refractive indexes 1.54 to 2.14 with no changes. The table can be skipped on a small stone.
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
Mint Tourmalines: Gemstones for Our Times
Tourmaline Engagement Rings: the Ultimate Guide
How Do Tourmalines Form?
Latest Articles
Sodalite Value, Price, and Jewelry Information
What are the Best Rough Sapphire Stones?
Advice for Determining Gemstone Value
Raw Stone Jewelry Design and Care
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!