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
82.2% Light Return
Angles for R.I. = 1.62
45 facets + 6 facets on girdle = 51
2-fold, mirror-image symmetry
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
Tourmaline Value, Price, and Jewelry Information
Mint Tourmalines: Gemstones for Our Times
Tourmaline Engagement Ring Stones: the Ultimate Guide
How Do Tourmalines Form?
Creating Ring Mountings for Deep-Cut Gemstones
How Does Topaz Form?
Prosopite Value, Price, and Jewelry Information
Gemstone Doublets, Triplets, and Other Assembled Stones
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!