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


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

“TB” (B31.JRG)
By Jeff R. Graham
Copyright 2001
84.2% Light Return
Angles for R.I. = 1.56
55 facets + 8 facets on girdle = 63
2-fold, mirror-image symmetry
96 index
L/W = 1.200 T/W = 0.729 T/L = 0.608
P/W = 0.620 C/W = 0.158
H/W = (P+C)/W+0.02 = 0.799
P/H = 0.777 C/H = 0.198
Vol./W^3 = 0.423

Addition # 5 – Notice when you cut the L/W=1.20 and the P1 tier it will meet at 96-24- 48-72. There are only four girdle facets for speed and yield. This will work in any R.I. from 1.54 to 1.76 (89.8%) with no changes.

 

 


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.