Faceting Design Diagram: Sword Oval – Sapphire / Corundum – Ruby, Ceylon, Padparadschah, Pink, Yellow, Green


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

Sword Oval (SAP13.JRG)
By Jeff R. Graham
Copyright 1995
77.3% Light Return
Angles for R.I. = 1.76
65 facets + 12 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.203 T/W = 0.542 T/L = 0.451
P/W = 0.482 C/W = 0.258
H/W = (P+C)/W+0.02 = 0.760
P/H = 0.634 C/H = 0.340
Vol./W^3 = 0.323

Gram Book 1 – This design cuts pretty normal, it makes a nice stone in lighter colored material. It’s got more light return than most ovals, and it’s not too shallow on the crown like some CAD designs, 1-8cts. This works in man- made Sapphire, and Spinel.


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.