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


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

Little Mick (B17.JRG) 2.46 carat Amethyst
By Jeff R. Graham
Copyright 2001
88.6% Light Return
Angles for R.I. = 1.62
61 facets + 16 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.172 T/W = 0.645 T/L = 0.550
P/W = 0.499 C/W = 0.203
H/W = (P+C)/W+0.02 = 0.722
P/H = 0.691 C/H = 0.281
Vol./W^3 = 0.307

Addition # 5 – This is a very low L/W oval and is designed to be cut in small material, but works well in any size. I often need a design like this for a quick oval in nodule shaped Tourmaline. This works in R.I. 1.62 to 1.93 (91.5%) 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.