Faceting Design Diagram: Origami Star – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Origami Star (MC43.JRG) Teal Tourmaline
By Jeff R. Graham
Copyright 2001
82% Light Return
Angles for R.I. = 1.62
23 facets + 7 facets on girdle = 30
1-fold, mirror-image symmetry
96 index
L/W = 1.146 T/W = 0.544 T/L = 0.474
P/W = 0.420 C/W = 0.205
H/W = (P+C)/W+0.02 = 0.645
P/H = 0.651 C/H = 0.318
Vol./W^3 = 0.219

Addition # 7 – This is an interesting design, it cuts fast and easy. The shape is a bit different, but I usually seem to have some rough that will cut this. Cut to center point, be careful of the L/W. Other than L/W this is easy… Cut in refractive Indexes 1.62 to 1.93(83.6%) with no changes.

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.