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


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

Slasher (MIR20.JRG)
By Jeff R. Graham
Copyright 2004
90% Light Return
Angles for R.I. = 1.62
41 facets + 8 facets on girdle = 49
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.288 T/L = 0.288
P/W = 0.436 C/W = 0.246
H/W = (P+C)/W+0.02 = 0.702
P/H = 0.621 C/H = 0.351
Vol./W^3 = 0.249

Addition # 9 – Note: The C3 tier only meets at the corners, it is center point. Cut it as evenly as you can, you may need to tweak it. This is very lively and nice in about any saturation. I like it in light pink Tourmaline like the Afghan pastel nodules that are sometimes available. The design is deep enough that it will not wash out pale color. Cut in refractive indexes 1.62 to 1.76 with no changes.

 

 


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.