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

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

Fancy Jeff Graham Facet Design Fancy Jeff Graham Facet Design

Fancy (MC101.JRG)
By Jeff R. Graham
Copyright 2006
86.2% Light Return
Angles for R.I. = 1.62
119 facets + 20 facets on girdle = 139
2-fold, mirror-image symmetry
96 index
L/W = 1.287 T/W = 0.791 T/L = 0.614 P/W = 0.562
C/W = 0.162 H/W = (P+C)/W+0.02 = 0.744 P/H = 0.755 C/H = 0.218 Vol./W^3 = 0.393

Addition # 12 – Cut to meet C6. Cut in refractive indexes 1.62 to 2.14 with no changes. Note: This is a little different to cut, the P2 over cuts the P1 leaving the breaks out at the girdle. Cut all the girdle facets as evenly as you can. P3 splits P1 at the girdle. Cut the P3 to center point and cut evenly from both sides a little at a time. You can leave the L/W a little long on the curved ends and them cut to match the P3.

Think out side the box… Cutting “Fancy”

Fancy 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.