Bethlaham Star: Faceting Design Diagram
An informational guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Bethlaham Star".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Bethlaham Star (MC76.JRG)
By Jeff R. Graham
Copyright 2001
82.2% Light Return
Angles for R.I. = 1.62
45 facets + 6 facets on girdle = 51
2-fold, mirror-image symmetry
96 index
L/W = 1.335 T/W = 0.238 T/L = 0.179
P/W = 0.406 C/W = 0.274
H/W = (P+C)/W+0.02 = 0.700
P/H = 0.580 C/H = 0.391
Vol./W^3 = 0.269
Addition # 7 - This is really very nice. When cutting the crown cut C1,C3,C4,C5,C6 as evenly as you can, there are no meets. You may have to cut the crown a couple of times to get the tiers even.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
