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


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

Shrike (CHECK6.JRG)3.64 carat Amethyst
By Jeff R. Graham
Copyright 2001
85.7% Light Return
Angles for R.I. = 1.54
48 facets + 8 facets on girdle = 56
2-fold, mirror-image symmetry
96 index
L/W = 1.000 P/W = 0.453 C/W = 0.212
H/W = (P+C)/W+0.02 = 0.685
P/H = 0.661 C/H = 0.309
Vol./W^3 = 0.225

Addition # 6 – A table can be cut in to meet C5 on a larger stone or a light colored stone. It is a good idea so that you do not have the hole at the apex. This design works very well for saturated material and is really what I designed it for. It will cut well in Peridot, Garnet, Sapphire, Spinel, and man-made materials.


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.