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Largest white diamond ever auctioned fetches $21M
'The Rock', a record-setting white diamond, goes up for auction | Reuters
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The Rock', a record-setting white diamond, goes up for auction | CNN
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Christie's “The Rock” Diamond Sells for Over $21 Million – Robb Report
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The Rock' diamond, goes up for auction
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Top 15 Most Expensive Gemstones In The World | Geology Page