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

Bound Star (TLINE26.JRG)
By Jeff R. Graham
Copyright 1995
77.5% Light Return
Angles for R.I. = 1.62
66 facets + 5 facets on girdle = 71
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.513 T/L = 0.488
P/W = 0.484 C/W = 0.220
H/W = (P+C)/W+0.02 = 0.724
P/H = 0.668 C/H = 0.304
Vol./W^3 = 0.252

Gram Book 1 - This design cuts pretty easy. The key is to get the steps the right size. It has a nice reflection of a 5 point star(s). I like this design in light colored material, NOTICE 80 index, 1-8cts. Cut in refractive index 1.62 to 1.76 (78.3%) with no changes.

 

 

Random - Cosine - ISO

Return to OnLine Design Index