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


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

Nifty Swifty (CHECK61.JRG)
By Jeff R. Graham
Copyright 2003
88.1% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
2-fold, mirror-image symmetry
96 index
L/W = 1.500 T/W = 0.495 T/L = 0.330
P/W = 0.437 C/W = 0.172
H/W = (P+C)/W+0.02 = 0.629
P/H = 0.694 C/H = 0.274
Vol./W^3 = 0.345

Addition # 8 – This works well in almost any Tourmaline. You may need to adjust the crown a bit depending on how you cut in C6. Hint: Leave C3 at a higher angle, cut the crown and then take up the slack if any.


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.