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

Thor's 1.225 (CHECK80.JRG)
By Jeff R. Graham
Copyright 2003
88.6% Light Return
Angles for R.I. = 1.62
45 facets + 17 facets on girdle = 62
1-fold, mirror-image symmetry
96 index
L/W = 1.225 T/W = 0.275 T/L = 0.224
P/W = 0.428 C/W = 0.192
H/W = (P+C)/W+0.02 = 0.640
P/H = 0.669 C/H = 0.300
Vol./W^3 = 0.228

Addition # 8 - This takes a lot of cutting but is worth the trouble and is very nice in about any material. Cut this in refractive indexes 1.62 to 1.93 with no changes. Be sure the pavilion point is centered over the dop when cutting the pavilion.

 

 

 

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