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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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“Smoke Rings” in a Non-Beryllium-Diffused Sapphire
A rare look at a smoke ring pattern identified in sapphire without the presence of beryllium.
Stellate Zircon in a Paraíba Tourmaline
Fiber-optic light reveals a remarkable set of stellate inclusions in blue-green Paraíba tourmaline.
Gem Pegmatites of Minas Gerais, Brazil: The Tourmalines of the Araçuaí Districts
This second article in the series on Minas Gerais describes the major tourmaline deposits which produce some of the finest specimens ever seen.
Interesting Red Tourmaline from Zambia
A new source of red tourmaline is identified in Zambia.
“Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS
Gem-quality bright blue to green “Paraíba”-type Cu-bearing tourmaline is now known from deposits in Africa (Nigeria and Mozambique), in addition to three commercial localities in Brazil (in Paraíba and Rio Grande do Norte States).
Trapiche Tourmaline from Zambia
Well-formed crystals of green tourmaline from northwestern Zambia show a growth pattern reminiscent of trapiche emerald/ruby when sliced perpendicular to the c-axis.
Paraíba Tourmaline with Unusual Coating
A coated Paraíba tourmaline is seen for the first time at a GIA lab.
Rubellite with Incredibly Strong “Pink Sleeves”
Radiation-induced pink sleeves are seen in a rubellite cabochon.
Blue Dravite-Uvite Tourmaline from Koksha Valley, Afghanistan
A new find of tourmaline yields surprising results.
Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia
The most important source of yellow gem elbaite is the Canary mining area in the Lundazi District of eastern Zambia.
Spring 1998 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.
