World's biggest aquamarine on show at Smithsonian Museum

Last updated at 15:27
The Dom Pedro aquamarineDonald E. Hurlbert/AFP/Getty Images

The world's largest aquamarine gem was put on display at a museum in the USA on Thursday.

It's called the Dom Pedro crystal and is 36cm long.

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See the aquamarine unveiled

It was donated to the Smithsonian's National Museum of Natural History last year.

Nobody is sure exactly how much it's worth but it was offered to the museum in the 1990s for over $7million (£3.5million)!