Faceting Design Diagram: Sapphire “RB.v” – Sapphire / Corundum – Ruby, Ceylon, Padparadschah, Pink, Yellow, Green


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

Sapphire “RB.v” (SAP16.JRG)
By Jeff R. Graham
Copyright 1998
86% Light Return
Angles for R.I. = 1.76
73 facets + 16 facets on girdle = 89
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.498 T/L = 0.498
P/W = 0.434 C/W = 0.214
H/W = (P+C)/W+0.02 = 0.668
P/H = 0.649 C/H = 0.321
Vol./W^3 = 0.220

Addition # 2 – This is pretty standard, I did it because I had a lot of people ask me for a little different round in Sapphire. Any light to medium material, 1-8cts. Cut in refractive indexes 1.54 (71%) to 2.14 (89.6%) with no changes.


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.