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

Glitter Roval (MC97.JRG)
By Jeff R. Graham
Copyright 2006
90% Light Return
Angles for R.I. = 1.62
121 facets + 10 facets on girdle = 131
2-fold, mirror-image symmetry
96 index
L/W = 1.414 T/W = 0.475 T/L = 0.336 P/W = 0.598
C/W = 0.281 H/W = (P+C)/W+0.02 = 0.898 P/H = 0.665 C/H = 0.313 Vol./W^3 = 0.529

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is very nice and cuts well in about any light to mediumly saturated material. This is not a good design for a beginner. It works best in a large stone.

 

 

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