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
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
This edited version of an article by the late Jeff Graham is part of a special archived informational series from Gram Faceting. Used with permission.
