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.

 

 

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