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

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

Jeff Graham Faceting Design Jeff Graham Faceting Design

Murmur (MIR73.JRG)
By Jeff R. Graham
Copyright 2005
85.5% light Return
Angles for R.I. = 1.62
61 facets + 10 facets on girdle = 71
10-fold, mirror-image symmetry
80 index
L/W = 1.051 T/W = 0.262 T/L = 0.250 P/W = 0.426
C/W = 0.260 H/W = (P+C)/W+0.02 = 0.706 P/H = 0.603 C/H = 0.369 Vol./W^3 = 0.238

Addition # 10 – Cut in refractive indexes 1.62 to 2.14 with no changes. This is pretty neat, it has a very flower-like look and is a different looking round. It is fun and fast to cut and works well in any light to medium colored material. I like Tourmaline.

Jeff Graham Faceting Design

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.