Faceting Design Diagram: Flat Eye – Spinel – Red, Pink, Lavender, Green, Blue, Orange, Violet


Spinel (Red, Pink, Lavender, Green, Blue, Orange, Violet)

Flat Eye (SPINEL8.JRG)
By Jeff R. Graham
Copyright 1998
76% Light Return
Angles for R.I. = 1.71
41 facets + 8 facets on girdle = 49
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.814 T/L = 0.651
P/W = 0.393 C/W = 0.143
H/W = (P+C)/W+0.02 = 0.556
P/H = 0.707 C/H = 0.257
Vol./W^3 = 0.194

Addition # 2 – This is very nice and helps use up some of that flat rough that I always put off cutting. It works well in Garnet, CZ, Zircon, and Sapphire. It’s light return is better than the ray trace says, 1/2-8cts.


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.