Faceting Design Diagram: Circus Tent – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Circus Tent (QTZ68.JRG)
By Jeff R. Graham
Copyright 1998
70% Light Return
Angles for R.I. = 1.54
105 facets + 16 facets on girdle = 121
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.392 T/L = 0.392
P/W = 0.440 C/W = 0.259
H/W = (P+C)/W+0.02 = 0.719
P/H = 0.612 C/H = 0.360
Vol./W^3 = 0.241

Addition # 3 – This is fairly easy to cut, the P5,P6,C4 tiers all do not have meets, cut them in as carefully as you can. The light return is much higher than the ray trace says. Cut in light to medium material, 1-14cts. This works well in Topaz. Cut in refractive indexes 1.73 to 2.14 (83.4%)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.