Faceting Design Diagram: Suz’s Bar – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Suz’s Bar (MC69.JRG)
By Jeff R. Graham
Copyright 2002
84.3% Light Return
Angles for R.I. = 1.62
29 facets + 10 facets on girdle = 39
2-fold, mirror-image symmetry
96 index
L/W = 3.000 T/W = 2.236 T/L = 0.745
P/W = 0.457 C/W = 0.201
H/W = (P+C)/W+0.02 = 0.678
P/H = 0.674 C/H = 0.297
Vol./W^3 = 1.015

Addition # 7 – This is fast to cut. Notice that the table has no meets, this is for weight retention and speed. This is designed for long Tourmaline crystals, especially if the rough has a gradual color change. Honestly, there is not much that can be cut in this type of rough. I designed this cut for that reason…

Random – Cosine – ISO

Detailed faceting instructions by Jeff Graham available at The Rock Peddler

Gram Faceting Archive of Information
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.