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


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

Acorn Tri (QTZ60.JRG)
By Jeff R. Graham
Copyright 1997
74% Light Return
Angles for R.I. = 1.54
70 facets + 6 facets on girdle = 76
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.532 T/L = 0.496
P/W = 0.457 C/W = 0.166
H/W = (P+C)/W+0.02 = 0.643
P/H = 0.710 C/H = 0.259
Vol./W^3 = 0.223

Addition # 3 – The P8 can be left off on a smaller stone. There are no real meets on the P6,P7 tiers be careful. This is a little harder to cut than normal and may take a couple of times to get right, 1-12cts. Cut in refractive indexes 1.54 to 1.76 (80.6%) 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.