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

Royal 8 (B13.JRG)
by Jeff R. Graham
Copyright 1999
90.9% Light Return
Angles for R.I. = 1.62
45 facets + 8 facets on girdle = 53
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.903 T/L = 0.723
P/W = 0.598 C/W = 0.156
H/W = (P+C)/W+0.02 = 0.775
P/H = 0.773 C/H = 0.202
Vol./W^3 = 0.444

Addition # 5 - This cuts pretty easy and has a great light return. Cut a 1.25 L/W preform first, this makes it easier to see the P1 meets at the girdle. I like this in a medium to light material. Cut this in R.I. 1.62 to 1.93 (89.8%) with no changes.

 

 

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