Faceting Design Diagram: Pulled Four – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Pulled Four (B21.JRG) 5.59 carat pink Tourmaline
By Jeff R. Graham
Copyright 2000
85.8% Light Return
Angles for R.I. = 1.62
47 facets + 8 facets on girdle = 55
2-fold, mirror-image symmetry
96 index
L/W = 1.159 T/W = 0.491 T/L = 0.423
P/W = 0.487 C/W = 0.240
H/W = (P+C)/W+0.02 = 0.747
P/H = 0.652 C/H = 0.321
Vol./W^3 = 0.285

Addition # 5 – This is a good design for light colored material and works well in Sapphire (84.2%), Peridot, Topaz, Tourmaline, Spinel, Garnet… Watch your L/W, if you are off the crown will need adjustments.


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.