Opal (Jelly, Cherry, Orange, Clear)

Shadow Star (OPAL4.JRG)
By Jeff R. Graham
Copyright 1993
63% Light Return
Angles for R.I. = 1.45
36 facets + 5 facets on girdle = 41
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.553 T/L = 0.526
P/W = 0.509 C/W = 0.224
H/W = (P+C)/W+0.02 = 0.753
P/H = 0.676 C/H = 0.297
Vol./W^3 = 0.281

Addition # 3 - Cutting a preform will save rough. Yes, the P4 facets are below the critical angle (C.A.) that's why I frost them and sometimes the P1's too. It gives the stone a nice star effect. The P4 can be left off too, if you want. This will work in Moldivite... Cut in refractive indexes 1.45 to 2.14 (72%) with no changes.

 

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