Faceting Design Diagram: Tut’s Pyramid – Quartz – Citrine, Amethyst, Ametrine, Smokey, Rose


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

Tut’s Pyramid (CHECK19.JRG) Zircon cut by Tony Carson
By Jeff R. Graham
Copyright 2001
81.8% Light Return
Angles for R.I. = 1.54
43 facets + 6 facets on girdle = 49
3-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.318 T/L = 0.276
P/W = 0.484 C/W = 0.217
H/W = (P+C)/W+0.02 = 0.720
P/H = 0.672 C/H = 0.301
Vol./W^3 = 0.287

Addition # 6 – Can be cut in refractive indexes 1.54 to 1.93 (89.1%)with no changes. Tourmaline is 84.7%, Zircon is 89.1%… Basically, the dark bars out near the corners just go away as the R.I. goes up. I left this in Quartz because it cuts a nice stone. 


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.