Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Rose (DOME24.JRG)
By Jeff R. Graham
Copyright 2007
86.1% Light Return
Angles for R.I. = 1.62
57 facets + 8 facets on girdle = 65
8-fold symmetry
96 index
L/W = 1.000 T/W = 0.184 T/L = 0.184 P/W = 0.405 C/W = 0.418
H/W = (P+C)/W+0.02 = 0.843 P/H = 0.480 C/H = 0.496
Vol./W^3 = 0.315
PAVILION
CROWN
Addition # 13 – Cut this in refractive indexes 1.62 to 2.14 with no changes. This is simple to cut and makes a very interesting design. I designed this for pale to light saturated material.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
IGS Newsletter