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

Glitter Mine #2 (MC89.JRG)
By Jeff R. Graham
Copyright 2003
87.6% Light Return
Angles for R.I. = 1.62
129 facets + 8 facets on girdle = 137
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.474 T/L = 0.474 P/W = 0.508
C/W = 0.188 H/W = (P+C)/W+0.02 = 0.717 P/H = 0.709 C/H = 0.263 Vol./W^3 = 0.297

Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. This works well in light to medium saturated material and needs to be a large stone. Rough in the table before cutting the star facets makes the meet easier.

 

 

 

Random - Cosine - ISO

Return to OnLine Design Index