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

Pat's Points (MC16.JRG)
By Jeff R. Graham
Copyright 1999
75.9% Light Return
Angles for R.I. = 1.62
35 facets + 7 facets on girdle = 42
1-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.844 T/L = 0.635
P/W = 0.614 C/W = 0.172
H/W = (P+C)/W+0.02 = 0.805
P/H = 0.762 C/H = 0.213
Vol./W^3 = 0.416

Addition # 4 - This is designed to be used in sets, it cuts pretty easy and has a nice flash. It works well around a square or trillion. Cut in about any material, I prefer medium color, 1/2ct and up. This works in Topaz... Cut this in R.I. 1.62 to 2.14 without changes.

 

 

 

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