Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Kling Dart (TLINE47.JRG)
By Jeff R. Graham
Copyright 1997
77% Light Return
Angles for R.I. = 1.62
34 facets + 6 facets on girdle = 40
3-fold, mirror-image symmetry
96 index
L/W = 1.036 T/W = 0.449 T/L = 0.434
P/W = 0.342 C/W = 0.141
H/W = (P+C)/W+0.02 = 0.503
P/H = 0.680 C/H = 0.280
Vol./W^3 = 0.139
Addition # 3 – This cuts fast and easy, and makes a nice stone in any material. I like it in pink tourmaline. I set this with double prongs to protect the corners, 1/2-8cts.
Random – Cosine – ISO
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.
