Crown Star: 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 "Crown Star".
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Crown Star (CHECK14.JRG)
By Jeff R. Graham
Copyright 2001
88% Light Return
Angles for R.I. = 1.62
53 facets + 12 facets on girdle = 65
4-fold, mirror-image symmetry
96 index
L/W = 1.000 T/W = 0.373 T/L = 0.373
P/W = 0.442 C/W = 0.180
H/W = (P+C)/W+0.02 = 0.642
P/H = 0.688 C/H = 0.281
Vol./W^3 = 0.259
Addition # 6 - Cut this in refractive indexes 1.62 to 1.92 with no changes. This makes a very bright and sparkly stone. Notice that the pavilion facets P5, P6 are creating a lot of movement.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Related Articles
Tourmaline Gem, Price, and Jewelry Information
Buying Gemstones in Afghanistan: A Beginner’s Guide
Some Advice for Cutting Tourmaline Gemstones
A Look at African Paraíba Tourmaline Rough
Latest Articles
800 Years of Mogok: A Celebration in Tenuous Times
What is the Average Gemstone Faceting Yield?
Pyroxmangite Value, Price, and Jewelry Information
How to Identify Emerald Simulants and Synthetics
Never Stop Learning
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
