Faceting Design Diagram: Flash’n Diamonds – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Flash’n Diamonds (CHECK62.JRG)
By Jeff R. Graham
Copyright 2003
80.1% Light Return
Angles for R.I. = 1.62
45 facets + 16 facets on girdle = 61
2-fold, mirror-image symmetry
96 index
L/W = 2.001 T/W = 0.536
T/L = 0.268 P/W = 0.472 C/W = 0.208
H/W = (P+C)/W+0.02 = 0.699
P/H = 0.674 C/H = 0.297
Vol./W^3 = 0.571

Addition # 8 – This is designed for crystal Tourmaline… There is not much that can be done with long crystals besides a rectangle, this is a nice change of pace. This works well in about any color. Cut in refractive indexes 1.62 to 1.93 with no 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.