Square’s Rule: 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 "Square's Rule".


Quartz (Amethyst, Citrine, Ametrine, Smokey, Rose)

Jeff Graham Facet Design

Square's Rule (MIR55.JRG)
By Jeff R. Graham
Copyright 2005
81.3% Light Return
Angles for R.I. = 1.54
25 facets + 4 facets on girdle = 29
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.209 T/L = 0.209 P/W = 0.435
C/W = 0.256 H/W = (P+C)/W+0.02 = 0.711 P/H = 0.611 C/H = 0.360 Vol./W^3 = 0.295




Addition # 10 - Note: The C3 can vary, but I like to cut it so that the C2 tier facets are as straight as possible. Cut this in refractive indexes 1.54 to 2.14 with no changes. Light to medium saturated stones work best.

Square's Rule_facet_Design_2

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!