Darhla: Faceting Design Diagram

Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Darhla".


Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Jeff Graham Faceting Design Jeff Graham Faceting Design

Darhla (MIR76.JRG)
By Jeff R. Graham
Copyright 2005
91.4% Light Return
Angles for R.I. = 1.62
41 facets + 10 facets on girdle = 51
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.287 T/L = 0.273 P/W = 0.433 C/W = 0.238
H/W = (P+C)/W+0.02 = 0.691 P/H = 0.627 C/H = 0.344
Vol./W^3 = 0.217



Addition # 10 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is very nice and works well in about any saturation. I tend to prefer light to medium saturated stones and I like it in Tourmaline. It is a great Topaz cut.

 Jeff Graham Faceting 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!