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


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

Poppy (CHECK74.JRG)Poppy cut by Tony Carson
By Jeff R. Graham
Copyright 2003
86.6% Light Return
Angles for R.I. = 1.62
31 facets + 8 facets on girdle = 39
2-fold, mirror-image symmetry
96 index
L/W = 1.233 T/W = 0.462 T/L = 0.374
P/W = 0.396 C/W = 0.166
H/W = (P+C)/W+0.02 = 0.582
P/H = 0.681 C/H = 0.285
Vol./W^3 = 0.196

Addition # 8 – Cut this in refractive indexes 1.62 to 1.93 with no changes. This is fast and easy, good for a novice who wants to try a checker board. I like this in any medium color and it works best in a medium size stone.


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.