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


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

Rosary (CHECK34.JRG)
By Jeff R. Graham
Copyright 2001
87.1% Light Return
Angles for R.I. = 1.62
49 facets + 16 facets on girdle = 65
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.410 T/L = 0.410
P/W = 0.407 C/W = 0.258
H/W = (P+C)/W+0.02 = 0.685
P/H = 0.594 C/H = 0.377
Vol./W^3 = 0.247

Addition # 6 – I designed this for some very pale Afghan Tourmaline nodules that I came across. This design will help deepen light colored material and will have a lot of sparkle. Cut this in refractive indexes 1.62 to 1.93 (89.6%) 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.