Spinel (Red, Pink, Lavender, Green, Blue, Orange, Violet)

Turning Wheel (SPINEL2.JRG)
By Jeff R. Graham
Copyright 1995
83.6% Light Return
Angles for R.I. = 1.71
7 3 facets + 8 facets on girdle = 81
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.513 T/L = 0.513
P/W = 0.415 C/W = 0.249
H/W = (P+C)/W+0.02 = 0.683
P/H = 0.607 C/H = 0.364
Vol./W^3 = 0.274

Addition # 2 - This design is easier than it looks. The facets on the pavilion line up in a spiral and are easy to see once you get started. Any material in a light to medium color works well, 1-12cts. Cut in refractive indexes 1.71 to 2.14 with no changes.

 

 

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