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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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Tools
Research
Cat’s-Eye Brazilian Paraíba Tourmaline
Chatoyant vivid blue Brazilian tourmaline is examined in the Bangkok lab.
Gemstone Guidebook Project
A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Tourmaline and Sapphire from Nigeria
An update on Nigerian colored stone production is obtained at the Tucson gem shows.
Cuprian Liddicoatite Tourmaline
Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.
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.
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.
