72 Brilliant: Faceting Design Diagram
Detailed information and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called 72 Brilliant.
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
72 Brilliant (DOME35.JRG)
By Jeff R. Graham
Copyright 2007
82.1% Light Return
Angles for R.I. = 1.62
64 facets + 9 facets on girdle = 73
9-fold, mirror-image symmetry
72 index
L/W = 1.015 T/W = 0.221 T/L = 0.218 P/W = 0.417 C/W = 0.326
H/W = (P+C)/W+0.02 = 0.763 P/H = 0.547 C/H = 0.427
Vol./W^3 = 0.257
PAVILION
CROWN
Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is easy to cut and works well in light to medium saturated material. This is a nice cut for Tourmaline nodules.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
