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


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

Jeff Graham Facet Design

 Jeff Graham Facet Design

Scanner (MIR58.JRG)
By Jeff R. Graham
Copyright 2005
87.8% Light Return
Angles for R.I. = 1.62
49 facets + 8 facets on girdle = 57
4-fold, mirror-image symmetry
72 index
L/W = 1.000 T/W = 0.363 T/L = 0.363 P/W = 0.421
C/W = 0.221 H/W = (P+C)/W+0.02 = 0.662 P/H = 0.636 C/H = 0.334 Vol./W^3 = 0.246

Addition # 10 – This cuts a little harder than it may look, especially if the stone is small. The C3,C4 tiers are delicate. This works well in light to medium saturated materials. Cut in refractive indexes 1.62 to 2.14 with no changes.

 Jeff Graham Facet Design

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.