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

by

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

Vampire (CHECK40.JRG)
By Jeff R. Graham
Copyright 2001
88.6% Light Return
Angles for R.I. = 1.62
45 facets + 16 facets on girdle = 61
2-fold, mirror-image symmetry
96 index
L/W = 1.247 T/W = 0.248 T/L = 0.199
P/W = 0.447 C/W = 0.178
H/W = (P+C)/W+0.02 = 0.645
P/H = 0.693 C/H = 0.276
Vol./W^3 = 0.317

Addition # 6 – This works in refractive indexes 1.62 to 1.93 with no changes. It is especially good in Garnet (89.6%), and is good for saturated materials.


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.