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