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


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

Split Phenomenon (MIR17.JRG) Citrine cut by Tony Carson
By Jeff R. Graham
Copyright 2004
91.8% Light Return
Angles for R.I. = 1.54
28 facets + 4 facets on girdle = 32
4-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.435 C/W = 0.226
H/W = (P+C)/W+0.02 = 0.680
P/H = 0.639 C/H = 0.332
Vol./W^3 = 0.264

Addition # 9 – Cut this in refractive indexes 1.54 to 1.93 with no changes. A table can be cut if the stone is large. This is designed for light colors and works well in about any material.


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.