Little Diff: Faceting Design Diagram

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


Beryl (Aquamarine, Emerald, Helidore, Bixbite, Goshenite, Morganite, Golden Beryl)

Little Diff (AQUA8.JRG)
By Jeff R. Graham
Copyright 1995
75% Light Return
Angles for R.I. = 1.56
47 facets + 8 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.739 T/L = 0.555
P/W = 0.512 C/W = 0.226
H/W = (P+C)/W+0.02 = 0.758
P/H = 0.675 C/H = 0.298
Vol./W^3 = 0.461

Addition # 2 - You need a preform. The P3, P4(G) facets don't meet anything except the girdle, just cut them until they look right. That's why 1.33 L/W preform is important. Also roughing in the table at C6 helps, 1-12cts.



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!