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