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

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

Jeff Graham Facet Design

Jeff Graham Facet Design

Dutch Winds (MIR47.JRG)

By Jeff R. Graham
Copyright 2005
90.4% Light Return
Angles for R.I. = 1.62
29 facets + 8 facets on girdle = 37
4-fold symmetry
96 index
L/W = 1.000 T/W = 0.172 T/L = 0.172 P/W = 0.422
C/W = 0.248 H/W = (P+C)/W+0.02 = 0.690 P/H = 0.612 C/H = 0.359 Vol./W^3 = 0.266

Addition # 10 Note: The corners on this design float. Cut them in to look right. You can vary the blades by changing the corner size. This is very nice in light to medium saturated materials and is again great for earrings. A table is not needed for small stones. Cut in refractive indexes 1.62 to 1.76 with no changes.



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.