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World’s largest white diamond could fetch $30M at auction

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The largest existing pear-shaped white diamond graded by the Gemological Institute of America is going up for auction.

The 228.31-carat white diamond, known as The Rock, may fetch as much as $30 million at auction in May, officials are estimating.

Christie's auction house officials said it's the largest white diamond to ever appear at auction.

Read more from Barron's.

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