Faceting Design Diagram: Np-Point – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Np-Point (QTZ48.JRG)
By Jeff R. Graham
Copyright 1996
73.6% Light Return
Angles for R.I. = 1.54
67 facets + 9 facets on girdle = 76
3-fold, mirror-image symmetry
96 index
L/W = 1.016 T/W = 0.542 T/L = 0.534
P/W = 0.430 C/W = 0.227
H/W = (P+C)/W+0.02 = 0.677
P/H = 0.635 C/H = 0.336
Vol./W^3 = 0.253

Addition # 1 – The P7 facets meet at the girdle only. It’s important to cut them evenly at the correct angle. The steps on the crown can be varied if you want, adjust the C7’s. Cut in refractive indexes 1.54 to 1.93 (80.2%) with no changes. This design is fairly hard to cut, 2-12cts.


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.