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


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

Diamond Star (CHECK31.JRG)
By Jeff R. Graham
Copyright 2001
87% Light Return
Angles for R.I. = 1.62
49 facets + 6 facets on girdle = 55
16-fold, mirror-image symmetry
120 index
L/W = 1.143 T/W = 0.321 T/L = 0.281
P/W = 0.517 C/W = 0.193
H/W = (P+C)/W+0.02 = 0.730
P/H = 0.709 C/H = 0.264
Vol./W^3 = 0.257

Addition # 6 – L/W is critical on this one, otherwise the diamonds on the top can be a pain to line up. Other than that it cuts easily and is a very unusual design.


Random – Cosine – ISO

 

Detailed faceting instructions by Jeff Graham available at The Rock Peddler