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