Faceting Design Diagram: 9 By Check Round – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

9 By Check Round (MC2.JRG) 1.89 carat Tourmaline
By Jeff R. Graham
Copyright 1999
92.8% Light Return
Angles for R.I. = 1.54
33 facets + 12 facets on girdle = 45
2-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.268 T/L = 0.268
P/W = 0.435 C/W = 0.209
H/W = (P+C)/W+0.02 = 0.664
P/H = 0.655 C/H = 0.315
Vol./W^3 = 0.224

Addition # 4 – This cuts fast and easy, be careful that the stone is round or the top will not meet. This works well in about any material, but I like it for darker stones to help make them brighter, 1-12cts. Works in Tourmaline and Topaz too… Cut this in R.I. 1.54 to 1.76 without changes.


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.