Deeply Ceylon Blue: Faceting Design Diagram

Successful tips and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Deeply Ceylon Blue"


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

Jeff R. Graham

The late Jeff Graham was a prolific faceter, creator of many original faceting designs, and the author of several highly-regarded instructional faceting books such as Gram Faceting Designs.

Never Stop Learning

When you join the IGS community, you get trusted diamond & gemstone information when you need it.

Become a Member

Get Gemology Insights

Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!