Penta Dome: Faceting Design Diagram

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

Penta Dome (DOME34.JRG)
By Jeff R. Graham
Copyright 2007
82.4% Light Return
Angles for R.I. = 1.62
91 facets + 9 facets on girdle = 100
9-fold, mirror-image symmetry
72 index
L/W = 1.015 T/W = 0.274 T/L = 0.270 P/W = 0.403 C/W = 0.370
H/W = (P+C)/W+0.02 = 0.793 P/H = 0.508 C/H = 0.466
Vol./W^3 = 0.279

PAVILION

CROWN

Addition # 13 - Cut in refractive indexes 1.62 to 2.14 with no changes. This is ideal for lightly saturated materials. It cuts easily and is not difficult. This is very good for pale saturated Afghan Tourmaline.

Detailed faceting instructions by Jeff Graham available at The Rock Peddler