Faceting Design Diagram: Royal 8 – Tourmaline – Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite


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

Royal 8 (B13.JRG)
by Jeff R. Graham
Copyright 1999
90.9% Light Return
Angles for R.I. = 1.62
45 facets + 8 facets on girdle = 53
2-fold, mirror-image symmetry
96 index
L/W = 1.250 T/W = 0.903 T/L = 0.723
P/W = 0.598 C/W = 0.156
H/W = (P+C)/W+0.02 = 0.775
P/H = 0.773 C/H = 0.202
Vol./W^3 = 0.444

Addition # 5 – This cuts pretty easy and has a great light return. Cut a 1.25 L/W preform first, this makes it easier to see the P1 meets at the girdle. I like this in a medium to light material. Cut this in R.I. 1.62 to 1.93 (89.8%) 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.