This undated handout photo provided by the Smithsonian Institution shows the obelisk-shaped Dom Pedro gem. 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 in Washington. 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. (AP Photo/Don Hurlbert, Smithsonian Institution)

Associated Press
This undated handout photo provided by the Smithsonian Institution shows the obelisk-shaped Dom Pedro gem. 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 in Washington. 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. (AP Photo/Don Hurlbert, Smithsonian Institution)
This undated handout photo provided by the Smithsonian Institution shows the obelisk-shaped Dom Pedro gem. 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 in Washington. 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. (AP Photo/Don Hurlbert, Smithsonian Institution)
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