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


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

North Star (QTZ16.JRG)
By Jeff R. Graham
Copyright 1993
75% Light Return
Angles for R.I. = 1.54
137 facets + 16 facets on girdle = 153
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.459 T/L = 0.459
P/W = 0.437 C/W = 0.181
H/W = (P+C)/W+0.02 = 0.638
P/H = 0.685 C/H = 0.283
Vol./W^3 = 0.215

Gram Book 1 – This stone is a mixed cut and it looks harder than it really is. It is important to cut the steps to the correct proportions (but not hard). Cut this design in about any material, 1-12cts. I prefer a larger stone and like it in medium/light colors, so the effect of the pattern shows. Cut in refractive index 1.54 to 2.14 (93.7%) with no 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.