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


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

Classic I (MC26.JRG) Tourmaline cut by Tony Carson
By Jeff R. Graham
Copyright 1999
88.6% Light Return
Angles for R.I. = 1.62
49 facets + 12 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.558 T/L = 0.558
P/W = 0.442 C/W = 0.164
H/W = (P+C)/W+0.02 = 0.626
P/H = 0.706 C/H = 0.262
Vol./W^3 = 0.252

Addition # 4 – This is one of my favorites to cut, it is fast and easy. Also this is such a classic shape most jewelers love to use it, and more important buy it. It works in any decent rough, 1cts+. Cut this in R.I. 1.62 to 2.14 (87%) without 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.