Faceting Design Diagram: Dragon’s Breath – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Dragon’s Breath (CHECK81.JRG)
By Jeff R. Graham
Copyright 2003
82.5% Light Return
Angles for R.I. = 1.62
45 facets + 6 facets on girdle = 51
6-fold, mirror-image symmetry
96 index
L/W = 1.155 T/W = 0.980 T/L = 0.849
P/W = 0.528 C/W = 0.148
H/W = (P+C)/W+0.02 = 0.696
P/H = 0.759 C/H = 0.212
Vol./W^3 = 0.278

Addition # 8 – Cut in refractive indexes 1.62 to 2.14 with no changes. This one is a little tough to cut and will take some adjusting on the crown depending on the machine and, of course, the cutter. This is nice in about material, but I like it in light to medium saturated material.


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.