Sheila: Faceting Design Diagram
Successful tips, details and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Sheila".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Sheila (MC113.JRG)
By Jeff R. Graham
Copyright 2002
79.2% Light Return
Angles for R.I. = 1.62
124 facets + 18 facets on girdle = 142
3-fold, mirror-image symmetry
96 index
L/W = 1.039 T/W = 0.459 T/L = 0.442 P/W = 0.506
C/W = 0.201 H/W = (P+C)/W+0.02 = 0.726 P/H = 0.696 C/H = 0.276 Vol./W^3 = 0.259
PAVILION
CROWN
Addition # 12 - Cut in refractive indexes 1.62 to 2.14 (83.3%) with no changes. This is really nice in medium colored material and needs to be cut in a large size. This cuts faster than it looks.
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
Chrome Tourmaline Buying Guide
A View of the Quartzsite Gem Shows
Mined in America: Top Spots for Gem Hunting in the US
Latest Articles
Opal Buying Guide
Amethyst Sources Around the World: The Geological Story Behind These Purple Gemstones
Brazilianite Value, Price, and Jewelry Information
Ruby-Glass Composites vs Leaded Glass Clarity Enhancements
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!