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


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

Prop (MC31.JRG)
By Jeff R. Graham
Copyright 1999
93.2% Light Return
Angles for R.I. = 1.54
25 facets + 8 facets on girdle = 33
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.351 T/L = 0.351
P/W = 0.458 C/W = 0.173
H/W = (P+C)/W+0.02 = 0.651
P/H = 0.704 C/H = 0.265
Vol./W^3 = 0.256

Addition # 4 – The corners on this are totally floating and can be cut to whatever size you need to optimize your rough with-out affecting the crown. This works well in medium to darker material, I use it for earrings, 1/2-6cts. This works in Tourmaline and Topaz. Cut this in R.I. 1.54 to 1.76 (89.9%) without 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.