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

Tantra (DOME3.JRG)
By Jeff R. Graham
Copyright 2007
82.8% Light Return
Angles for R.I. = 1.62
61 facets + 12 facets on girdle = 73
6-fold, mirror-image symmetry
96 index
L/W = 1.036 T/W = 0.258 T/L = 0.249 P/W = 0.397
C/W = 0.360 H/W = (P+C)/W+0.02 = 0.777 P/H = 0.511 C/H = 0.463 Vol./W^3 = 0.276

Addition # 13 - Got a pale Tourmaline nodule? This design is ideal for light roundish rough. Cut in refractive indexes 1.62 to 1.93 with no changes. It is a good idea to cut a large stone so that the crown shows.

 

 

 

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