Faceting Design Diagram: “R” Crossed – Sapphire / Corundum – Ruby, Ceylon, Padparadschah, Pink, Yellow, Green


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

“R” Crossed (SAP19.JRG)
By Jeff R. Graham
Copyright 1998
75% Light Return
Angles for R.I. = 1.76
61 facets + 12 facets on girdle = 73
2-fold, mirror-image symmetry
96 index
L/W = 1.500 T/W = 0.908 T/L = 0.606
P/W = 0.445 C/W = 0.200
H/W = (P+C)/W+0.02 = 0.665
P/H = 0.669 C/H = 0.301
Vol./W^3 = 0.406

Addition # 2 – Roughing in the table at about the time you cut the C5 tier makes this much easier to meet. This design is a hard one to cut because of the meets on the crown, but it makes a very nice stone, 1-18cts. This works well in man-made material.


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.