Two Spin Star : Faceting Design Diagram
Successful tips and guide on Faceting Designs. A Faceting Design Diagram by Jeff R. Graham that presents various cuts, this one is called "Two Spin Star".
Two Spin Star (QTZ29.JRG)
By Jeff R. Graham
92.8% Light Return
Angles for R.I. = 1.54
30 facets + 6 facets on girdle = 36
L/W = 1.155 P/W = 0.450 C/W = 0.164
H/W = (P+C)/W+0.02 = 0.635
P/H = 0.709 C/H = 0.259
Vol./W^3 = 0.215
Gram Book 1 - This design cuts easy and fast. When you get to C3 use a fine lap and cut gently. It is a nice design for about any material and I usually cut it in 4-8mm sizes. I designed it for earrings. On larger stones a table should be cut to meet C2,C3. I recommend this because as the stone gets larger there is a "hole" at the apex (look at the ray trace). Cut in refractive index 1.54 to 2.14 (86.5%) with no changes.
Random - Cosine - ISO
Detailed faceting instructions by Jeff Graham available at The Rock Peddler
Rose Quartz Value, Price, and Jewelry Information
Ametrine Value, Price, and Jewelry Information
Amethyst Value, Price, and Jewelry Information
Citrine Value, Price, and Jewelry Information
What is the Best Lap for Polishing Sapphire?
Seven Famous Pearls and Their Histories
Opal Stones and Gems: Value, Price, and Jewelry Information
Seven Stunning but Delicate Engagement Ring 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!