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

Queens Square II (AQUA5.JRG)
By Jeff R. Graham
Copyright 1993
82.1% Light Return
Angles for R.I. = 1.56
61 facets + 12 facets on girdle = 73
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.532 T/L = 0.532
P/W = 0.447 C/W = 0.211
H/W = (P+C)/W+0.02 = 0.679
P/H = 0.659 C/H = 0.312
Vol./W^3 = 0.273

Gram Book 1 - This design is tougher than it looks. The C6 facets must be cut exactly for the table to meet. If you have a keyed dop you can cut the table first, then cut the C6 facets to meet, 1-8cts. Cut in refractive index 1.56 to 2.14 (85.6%) with no changes.

 

 

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