At 20.46 carats, the gem is one of the rarest stones in the world, and "sits in the very top bracket of all-time historical blue diamond finds", the company said in a statement.
The oval-shaped diamond has been named "The Okavango Blue" in honour of the Okavango Delta, the country's wildlife-rich world heritage site.
"It is incredibly unusual for a stone of this colour and nature to have come from Botswana -- a once-in-lifetime find, which is about as rare as a star in the Milky Way," said Okavango Diamond Company managing director Marcus ter Haar. "It is little surprise blue diamonds are so sought after around the world as only a very small percentage of the world's diamonds are classified as fancy colour," he added.
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