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Smithsonian to unveil largest aquamarine gem

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WASHINGTON (AP) — The world's largest cut aquamarine gem will soon go on display in its new home at the Smithsonian's National Museum of Natural History. The museum will unveil the obelisk-shaped Dom Pedro gem Thursday for long-term display. The blue-green crystal was mined in Brazil in the late 1980s and is named for Brazil's first two emperors. The gem was designed and cut by gem...