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


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

Cushion Triple Star (TLINE9.JRG)
By Jeff R. Graham
Copyright 1993
80.9% Light Return
Angles for R.I. = 1.62
89 facets + 16 facets on girdle = 105
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.539 T/L = 0.539
P/W = 0.449 C/W = 0.210
H/W = (P+C)/W+0.02 = 0.679
P/H = 0.662 C/H = 0.309
Vol./W^3 = 0.248

Gram Book 1 – This is a nice design for most any material and/or color. It cuts pretty fast and is not hard, yet it looks like it is involved to do, 1-16cts. Cut in refractive index 1.62 to 2.14 (83.9%) 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.