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


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

Jeff Graham Facet Design

 Jeff Graham Facet Design

Delight (MIR51.JRG)
By Jeff R. Graham
Copyright 2005
92.8% Light Return
Angles for R.I. = 1.62
63 facets + 18 facets on girdle = 81
9-fold, mirror-image symmetry
72 index
L/W = 1.015 P/W = 0.410 C/W = 0.198
H/W = (P+C)/W+0.02 = 0.628 P/H = 0.653 C/H = 0.315
Vol./W^3 = 0.205

 

Addition # 10 – This is neat. Note: The P3 tier can vary, which will make the C2 crown vary a bit too. Cut P3 as evenly and as close to the diagram as you can, but do not be afraid to experiment. This is ideal in light to medium saturated materials. A table can be cut on a larger stone. 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.