Faceting Design Diagram: Little Diff- Beryl – Aquamarine, Emerald, Helidore, Bixbite, Goshenite, Morganite, Golden Beryl


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

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.