Faceting Design Diagram: Green “O” – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Green “O” (TLINE3.JRG)
By Jeff R. Graham
Copyright 1995
79% Light Return
Angles for R.I. = 1.62
63 facets + 14 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.400 T/W = 0.829 T/L = 0.592
P/W = 0.449 C/W = 0.188
H/W = (P+C)/W+0.02 = 0.656
P/H = 0.683 C/H = 0.286
Vol./W^3 = 0.350

Addition # 1 – This design is med-hard to cut and gives very nice return on crystal shaped rough. Cut in light to medium material, 2-12cts. Good in Topaz.


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.