Seven Rattle: Faceting Design Diagram
Helpful tips, details and guide on Faceting Designs. Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Seven Rattle"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Seven Rattle (DOME32.JRG)
By Jeff R. Graham
Copyright 2007
87.8% Light Return
Angles for R.I. = 1.62
71 facets + 7 facets on girdle = 78
7-fold, mirror-image symmetry
77 index
L/W = 1.026 T/W = 0.410 T/L = 0.399 P/W = 0.398 C/W = 0.339
H/W = (P+C)/W+0.02 = 0.757 P/H = 0.525 C/H = 0.448
Vol./W^3 = 0.280
PAVILION
CROWN
Addition # 13 - Cut this in refractive indexes 1.62 to 2.14 with no changes. This is unusual and because it is seven-sided, it will need a custom setting. It has a lot of flash and looks very unusual when cut.
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
