Faceting Design Diagram: 133 Oval – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

133 Oval (B2.JRG)
By Jeff R. Graham
Copyright 2001
88.8% Light Return
Angles for R.I. = 1.62
65 facets + 12 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.330 T/W = 0.845 T/L = 0.635
P/W = 0.569 C/W = 0.193
H/W = (P+C)/W+0.02 = 0.781
P/H = 0.728 C/H = 0.247
Vol./W^3 = 0.414

Addition # 5 – This is nice and works well in R.I. 1.62-1.93 with no changes. This is a good basic standard oval Barion, with a lot of performance. The number of facets is fairly low and this cuts pretty fast.


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.