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Tourmaline
Tourmalines have a variety of exciting colors with one of the widest color ranges of any gem.
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Afghan Emerald, Tajik Ruby, and Clarity-Enhanced Tourmaline
Updates on Afghan and Tajik materials, as well as treatment options to improve the clarity of various types of tourmaline.Updates on Afghan and Tajik materials, as well as treatment options to improve the clarity of various types of tourmaline.
Paula Crevoshay’s American Collection, Plus Jewelry with Nontraditional Gemstones
Lesser-known gem materials are seen in pieces alongside a collection created as an artistic inheritance for future generations of jewelry fans.
Stars Are Out in Paraíba Tourmaline
Rare material from Brazil features four-ray stars under point-source light.
Unique Tourmaline Necklace
An unusual parti-color tourmaline necklace and clasp are seen at the 2015 AGTA show in Tucson.
Bicolor Double-Eye Tourmaline
A tourmaline displaying different colors of chatoyancy on opposite sides of a double cabochon is examined.
High-End Colored Gems
A unique assortment of colored gemstones as seen at the GJX show in Tucson.
Larger Optic Disks
Exceptional innovations using gem and mineral rough at Tucson’s GJX show.
From Brazil to China: The Journey of Rubellite Tourmaline
After documenting tourmaline production at the famous Cruzeiro mine in Brazil, GIA takes you to China, where you can witness the cutting of these stones for entry into the hottest tourmaline market in the world.
Expedition to the Cruzeiro Tourmaline Mine in Minas Gerais, Brazil
Journey with us to Brazil for a visit to one of the world’s most prolific tourmaline mines. You’ll also hear a highly captivating story of family success through perseverance.
An Overview of the 2014 GIA Brazil Expedition
Join GIA’s field gemologists as they venture into some of Brazil’s most important and productive emerald and tourmaline mines.
