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

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

Ceylon Blues (MC56.JRG)
By Jeff R. Graham
Copyright 2002
82.7% Light Return
Angles for R.I. = 1.76
65 facets + 12 facets on girdle = 77
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.500 T/L = 0.500
P/W = 0.478 C/W = 0.176
H/W = (P+C)/W+0.02 = 0.674
P/H = 0.709 C/H = 0.262
Vol./W^3 = 0.280

Addition # 7 – The P5 establishes the P6(G) girdle corners by cutting to meet P3, P4 junction. You can save rough by just letting the corners float in… Doing it this way will make the crown slightly different, but will cause no problems. This is designed for re-cutting native cut Sapphires. I have made this design a mixed cut (like the native cuts) to help with yield and the brilliant crown increases sparkle. This design will probably darken most Sapphires a bit.

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.