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


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

Click Cushion (B27.JRG)
By Jeff R. Graham
Copyright 2001
89.2% Light Return
Angles for R.I. = 1.62
53 facets + 8 facets on girdle = 61
2-fold, mirror-image symmetry
96 index
L/W = 1.200 T/W = 0.639 T/L = 0.533
P/W = 0.532 C/W = 0.197
H/W = (P+C)/W+0.02 = 0.749
P/H = 0.711 C/H = 0.263
Vol./W^3 = 0.354

Addition # 5 – Cut a preform L/W=1.20… The P1 tier will meet the girdle only at 96-24-48-72. This is actually fast and pretty easy to cut. This works with no changes R.I. 1.62 to 1.93 (89.1%). Notice C5 will absorb a bit if your L/W is slightly off.


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.