Faceting Design Diagram: Saw Tooth Marquise – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite

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

Saw Tooth Marquise (MC30.JRG)
By Jeff R. Graham
Copyright 1998
77.2 Light Return
Angles for R.I. = 1.62
45 facets + 12 facets on girdle = 57
2-fold, mirror-image symmetry
96 index
L/W = 2.000 T/W = 1.380 T/L = 0.690
P/W = 0.442 C/W = 0.118
H/W = (P+C)/W+0.02 = 0.580
P/H = 0.762 C/H = 0.204
Vol./W^3 = 0.413

Addition # 4 – Almost no light is lost thru the pavilion except for the outside points on this design. It is not super bright, but with a 2.0 L/W and also a marquise, it is a lot better than most. It cuts bright and is very good for a lot of the long thin material(shaped crystals) that are available lately, 1-12cts. This also works in Garnet, Sapphire and Topaz.

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.