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


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

Spice (CHECK68.JRG)
By Jeff R. Graham
Copyright 2003 91.4%
Light Return Angles for R.I. = 1.62
25 facets + 4 facets on girdle = 29
4-fold, mirror-image symmetry
96 index
L/W = 1.001 T/W = 0.486 T/L = 0.485
P/W = 0.466 C/W = 0.155
H/W = (P+C)/W+0.02 = 0.642
P/H = 0.727 C/H = 0.242
Vol./W^3 = 0.282

Addition # 8 – Cut this in refractive indexes 1.54 (90.1%) to 2.14 (91.4%) with no changes. This design tends to be bright and works well in any material. It’s not tough to cut and is a good diamond checker choice for a novice.


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.