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

Scholar (CHECK24.JRG)
By Jeff R. Graham
Copyright 2001
89.7% Light Return
Angles for R.I. = 1.62
45 facets + 10 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.402 T/L = 0.322
P/W = 0.489 C/W = 0.255
H/W = (P+C)/W+0.02 = 0.763
P/H = 0.640 C/H = 0.333
Vol./W^3 = 0.344

Addition # 6 - The crown on this design is a little tougher than usual to cut. The C4, C5, C6, stripes cut in until they look right, no meets on the C6. The best thing to do is rough them in and get the right proportions. This cuts in refractive indexes 1.62 to 1.93 with no changes. This works well in dark material.

 

 

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