Sapphire / Corundum (Ruby, Ceylon, Padparadschah, Pink, Yellow, Green)

Four Square Sapphire (SAP.JRG)
By Jeff R. Graham
Copyright 1994
85.9% Light Return
Angles for R.I. = 1.76
45 facets + 8 facets on girdle = 53
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.493 T/L = 0.493
P/W = 0.438 C/W = 0.206
H/W = (P+C)/W+0.02 = 0.665
P/H = 0.659 C/H = 0.311
Vol./W^3 = 0.241

Gram Book 1 - Here is a nice design, it cuts fast and is good in about any size or color. The top is a little different to cut, so pay attention, it is not hard. 1/2-6cts. Cut in refractive index 1.76 to 1.93 (86.5%) with no changes.

 

 

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