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Diamonds erupted to the Earth's surface by volcanic pipes are generally xenocrysts -- foreign crystals, included within kimberlite diatremes. At the mine site, rocks are tumbled to separate the diamonds from the surrounding material under running water.

Alluvial diamonds are found in riverbeds and at the mouths of rivers that flow over diamond-producing volcanic pipes, and are naturally already separated from the surrounding material.

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Q: How are diamonds extracted from their ore?
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