Est #1: 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 "Est #1".

0

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

Est #1 (TLINE51.JRG)
By Jeff R. Graham
Copyright 1998
81% Light Return
Angles for R.I. = 1.62
29 facets + 4 facets on girdle = 33
2-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.444 T/L = 0.444
P/W = 0.495 C/W = 0.139
H/W = (P+C)/W+0.02 = 0.654
P/H = 0.757 C/H = 0.212
Vol./W^3 = 0.336

Addition # 3 - This cuts like a pretty standard step cut. The only different thing about it is the high light return. Try it in a good med color tourmaline of about any color, 1-18cts. Can be cut as a rectangle any L/W, put the "c" axis on Tourmaline on the steep ends... Cut in refractive indexes 1.62 to 2.14 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.

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!