Faceting Design Diagram: Point Mounty – Sapphire / Corundum – Ruby, Ceylon, Padparadschah, Pink, Yellow, Green


Sapphire / Corundum (Ruby, Ceylon, Padparadschah, Pink, Yellow, Green)

Point Mounty (SAP9.JRG) 4.08 Rhodolite Garnet
By Jeff R. Graham
Copyright 1995
80.7% Light Return
Angles for R.I. = 1.77
67 facets + 12 facets on girdle = 79
2-fold, mirror-image symmetry
96 index
L/W = 1.203 T/W = 0.583 T/L = 0.484
P/W = 0.452 C/W = 0.241
H/W = (P+C)/W+0.02 = 0.713
P/H = 0.634 C/H = 0.337
Vol./W^3 = 0.304

Addition # 3 – Cutting the table in (or almost) is a help when you are cutting the other facets that have to meet. This design cuts nice, but it should be cut in a larger size stone, 2-10cts. Man-made Sapphire YAG, and Spinel works…


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.