A big blue diamond weighing more than 20 carats has been unveiled in Botswana, where the gem was discovered.
A company statement says it is "in the very top bracket of all-time historical blue diamond finds."
The bright blue colour is attributed to the mineral boron, which was present in the rocks of oceans when the diamond was formed some 1 to 3 billion years ago.
The company says the diamond is expected to be sold near the end of the year.
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