Faceting Design Diagram: Trig – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Trig (CHECK12.JRG) 3.03 carat Aquamarine
By Jeff R. Graham
Copyright 2001
83.7% Light Return
Angles for R.I. = 1.54
52 facets + 12 facets on girdle = 64
3-fold, mirror-image symmetry
96 index
L/W = 1.013 T/W = 0.239 T/L = 0.236
P/W = 0.391 C/W = 0.199
H/W = (P+C)/W+0.02 = 0.609
P/H = 0.641 C/H = 0.326
Vol./W^3 = 0.192

Addition # 6 – Notice that the crown on this design is deep to help darken light colored material. The only light loss is at the edge of the girdle, where prongs will cover it.


Random – Cosine – ISO

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.