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

Rosary (CHECK34.JRG)
By Jeff R. Graham
Copyright 2001
87.1% Light Return
Angles for R.I. = 1.62
49 facets + 16 facets on girdle = 65
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.410 T/L = 0.410
P/W = 0.407 C/W = 0.258
H/W = (P+C)/W+0.02 = 0.685
P/H = 0.594 C/H = 0.377
Vol./W^3 = 0.247

Addition # 6 - I designed this for some very pale Afghan Tourmaline nodules that I came across. This design will help deepen light colored material and will have a lot of sparkle. Cut this in refractive indexes 1.62 to 1.93 (89.6%) with no changes.

 

 

 

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