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


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

Checker Star (TLINE15.JRG)
By Jeff R. Graham
Copyright 1994
81.3% Light Return
Angles for R.I. = 1.62
49 facets + 12 facets on girdle = 61
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.538 T/L = 0.538
P/W = 0.431 C/W = 0.178
H/W = (P+C)/W+0.02 = 0.628
P/H = 0.685 C/H = 0.283
Vol./W^3 = 0.266

Addition # 1 – This design is a good one to cut if you would like a little challenge, (just a little). It is pretty straight forward to cut and makes a nice stone in any light to medium material, 1/2-6cts. Cut in refractive indexes 1.62 to 1.93 (87.3%) 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.