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


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

Iota (CHECK64.JRG)
By Jeff R. Graham
Copyright 2003
88.2% Light Return
Angles for R.I. = 1.54
93 facets + 8 facets on girdle = 101
12-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.343
T/L = 0.343 P/W = 0.446 C/W = 0.146
H/W = (P+C)/W+0.02 = 0.612
P/H = 0.729 C/H = 0.239
Vol./W^3 = 0.185

Addition # 8 – Notice that the burst on the pavilion only meets the breaks at two places/break on each side. Cut in refractive indexes 1.54 to 2.14 (91.3%) with no changes. This works well in about any colored 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.