Faceting Design Diagram: Elizabeth’s Flash – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Elizabeth’s Flash (CHECK20.JRG) 19.89 carat Tourmaline
By Jeff R. Graham
Copyright 2001
89.5% Light Return
Angles for R.I. = 1.62
27 facets + 4 facets on girdle = 31
2-fold, mirror-image symmetry
96 index
L/W = 1.200 T/W = 0.320 T/L = 0.267
P/W = 0.466 C/W = 0.231
H/W = (P+C)/W+0.02 = 0.717
P/H = 0.650 C/H = 0.322
Vol./W^3 = 0.489

Addition # 6 – This is designed to be deep for high yield return… I originally had a tri-colored crystal-shaped piece of Tourmaline rough that I designed this for. It was such an unusual piece of rough and I did not want to waste any of it. This works well in about any color, I particularly like it in multi-colored Tourmaline. It will tend to darken a bit…

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.