Faceting Design Diagram: Equal – Beryl – Aquamarine, Emerald, Helidore, Bixbite, Goshenite, Morganite, Golden Beryl


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

Equal (B38.JRG)
By Jeff R. Graham
Copyright 2001
82.2% Light Return
Angles for R.I. = 1.56
49 facets + 9 facets on girdle = 58
3-fold, mirror-image symmetry
96 index
L/W = 1.010 T/W = 0.500 T/L = 0.495
P/W = 0.508 C/W = 0.169
H/W = (P+C)/W+0.02 = 0.697
P/H = 0.729 C/H = 0.242
Vol./W^3 = 0.260

Addition # 5 – This can be cut with no changes in 1.56 to 1.93 and the performance is almost identical. This cuts fast and easy. It’s a good design for a new cutter.


Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler