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 Jeff Graham Facet DesignSheila Jeff Graham Facet Design

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



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.

Sheila Jeff Graham Facet Design

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.

Never Stop Learning

When you join the IGS community, you get trusted diamond & gemstone information when you need it.

Become a Member

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!