Faceting Design Diagram: Square’s Rule – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Gram Faceting Archive of Information
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.