Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)

Octagon Lace (MIR59.JRG)
By Jeff R. Graham
Copyright 2005
91% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
8-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.246 T/L = 0.246 P/W = 0.438
C/W = 0.209 H/W = (P+C)/W+0.02 = 0.667 P/H = 0.657 C/H = 0.313 Vol./W^3 = 0.243

Addition # 10 - This is fun and easy to cut. Note: The P3 tier cuts through the girdle line. When you cut the C1 just leave enough so that the points are not fragile. This design has a very interesting and unique pattern. I like in about any saturation. Cut in refractive indexes 1.62 to 2.14 with no changes.

 

 

 

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