Why Did Botswana Win the Diamond Lottery So Hard?

Of the 10 largest rough diamonds ever mined, 6 of them have come from the African nation of Botswana. Russia is the only country that produces more diamonds by volume, but the individual gems don't tend to be as large. So why is Botswana so special? It's a confluence of factors that requires us to look hundreds of kilometers beneath the Earth's surface.

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