Faceting Design Diagram: Bi-Color Split – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Bi-Color Split (TLINE66.JRG)
By Jeff R. Graham
Copyright 1998
83% Light Return
Angles for R.I. = 1.62
33 facets + 8 facets on girdle = 41
2-fold, mirror-image symmetry
96 index
L/W = 2.000 T/W = 1.446 T/L = 0.723
P/W = 0.536 C/W = 0.236
H/W = (P+C)/W+0.02 = 0.793
P/H = 0.677 C/H = 0.298
Vol./W^3 = 0.855

Addition # 3 – Thanks to a friend of mine named Paul I got this idea from him (with his permission) and put my own spin on it. This design is for bi-colored Tourmaline, it flashes from the middle to the edge depending on how it’s rocked, 1-24cts.


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.