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


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

Deeply Ceylon Blue (MC59.JRG)
By Jeff R. Graham
Copyright 2002
81.9% Light Return
Angles for R.I. = 1.76
85 facets + 12 facets on girdle = 97
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.500 T/L = 0.500
P/W = 0.555 C/W = 0.176
H/W = (P+C)/W+0.02 = 0.751
P/H = 0.739 C/H = 0.235
Vol./W^3 = 0.339

Addition # 7 – The corners just need to be cut in on this until they look right to you. They are made to float for weight yield. This is designed for deep native cut stones.


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.