On Tuesday, Botswana premiered a blue diamond that could outstrip the storied Hope Diamond: the 20.46-carat, close-to-flawless Okavango Blue.

Blue diamonds are very rare, comprising only about 0.02% of mined diamonds. PRETORIA, South Africa -- Botswana unveiled the largest rare blue diamond ever discovered within its borders: a super ...

The Hope Diamond, which was originally mined in India but is now housed at the National Museum of Natural History, has a lower clarity rating of VS1, but a larger size at 45.5 carats.

On Tuesday, Botswana premiered a blue diamond that could outstrip the storied Hope Diamond: the 20.46-carat, close-to-flawless Okavango Blue.