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


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

Bound Star (TLINE26.JRG)
By Jeff R. Graham
Copyright 1995
77.5% Light Return
Angles for R.I. = 1.62
66 facets + 5 facets on girdle = 71
5-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.513 T/L = 0.488
P/W = 0.484 C/W = 0.220
H/W = (P+C)/W+0.02 = 0.724
P/H = 0.668 C/H = 0.304
Vol./W^3 = 0.252

Gram Book 1 – This design cuts pretty easy. The key is to get the steps the right size. It has a nice reflection of a 5 point star(s). I like this design in light colored material, NOTICE 80 index, 1-8cts. Cut in refractive index 1.62 to 1.76 (78.3%) 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.