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