The Rock, an egg-sized diamond, fetches $31.5 million on auction in Geneva - ABC News

An egg-sized white diamond billed as the largest of its kind to go up for auction sells for $31.5 million in Geneva.

An egg-sized white diamond called The Rock, billed as the largest of its kind to go up for auction, sold on Wednesday for more than 21.6 million Swiss francs ($31.5 million).

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