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

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

Handy Cushion (B26.JRG) 5.46 carat Nigerian pink Tourmaline
By Jeff R. Graham
Copyright 2001
87.1% Light Return
Angles for R.I. = 1.62
65 facets + 12 facets on girdle = 77
2-fold, mirror-image symmetry
96 index
L/W = 1.200 T/W = 0.682 T/L = 0.568
P/W = 0.525 C/W = 0.186
H/W = (P+C)/W+0.02 = 0.731
P/H = 0.718 C/H = 0.254
Vol./W^3 = 0.374

Addition # 5 – I cut a lot of cushions, and there seems to be a lack of high quality fast ones that are fast to cut. The breaks can be cut in another order, also notice the C8 does not have a meet at the girdle. This is to absorb a little if your L/W is off. This can be cut in R.I 1.62 to 1.93 (89.3%) 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.