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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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Summer 2012 Gem News International
Winter 2010 Gem News International
Update on Ametrine from the Yuruty Mine, Bolivia
Winter 2009 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines
The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.
Summer 2009 G&G Lab Notes
Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique
Copper-Bearing (Paraíba-Type) Tourmaline from Mozambique
Copper-bearing tourmaline from Mozambique was first recovered in 2001, but its Cu content was not recognized until 2003, and it was not widely sold with its Mozambique origin disclosed until 2005.
Mt. Mica: A Renaissance in Maine’s Gem Tourmaline Production
The Mt. Mica area in southwestern Maine has been mined for tourmaline and other pegmatite gems since the 1820s.
Liddicoatite Tourmaline from Anjanabonoina, Madagascar
An Update on “Paraíba” Tourmaline from Brazil
Vivid blue, green, and purple-to-violet cuprian elbaites, renowned in the gem trade as “Paraíba” tourmalines, continue to be recovered in small amounts from northeastern Brazil.
