Faceting Design Diagram: Near “P” – Beryl – Aquamarine, Emerald, Helidore, Bixbite, Goshenite, Morganite, Golden Beryl


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

Near “P” (B4.JRG)
By Jeff R. Graham
Copyright 2001
79.3% Light Return
Angles for R.I. = 1.56
81 facets + 16 facets on girdle = 97
2-fold, mirror-image symmetry
96 index
L/W = 1.345 T/W = 0.873 T/L = 0.649
P/W = 0.604 C/W = 0.192
H/W = (P+C)/W+0.02 = 0.816
P/H = 0.741 C/H = 0.235
Vol./W^3 = 0.438

Addition # 5 – 85.9% in R.I. 1.62 with no changes, 89.9% in 1.93… This design is L/W=1.33 for all practical purposes and works very well in lighter colored large material.

 

 


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.