Nigerian Cushion: 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 "Nigerian Cushion"
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Nigerian Cushion (B12.JRG)
By Jeff R. Graham
87.2% Light Return
Angles for R.I. = 1.62
73 facets + 16 facets on girdle = 89
4-fold, mirror-image symmetry
L/W = 1.000 T/W = 0.534 T/L = 0.534
P/W = 0.477 C/W = 0.179
H/W = (P+C)/W+0.02 = 0.676
P/H = 0.706 C/H = 0.265
Vol./W^3 = 0.263
Addition # 5 - I designed this for some of that large pink Tourmaline that has been coming out of Nigeria. It cuts easy and fairly fast for a Barion. This is best in light to medium color, clean materials. This works well in R.I. 1.62 to 1.76 (89.1%) with no changes. I use this as my default square cushion…
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?
Seven Famous Pearls and Their Histories
Opal Stones and Gems: Value, Price, and Jewelry Information
Seven Stunning but Delicate Engagement Ring Stones
Advice For Grading Dark Colored Gemstones
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!