Switzerland Jewelry Auction

A Christie's employee displays "The Ocean Dream", the largest fancy vivid blue-green diamond, weighting 5.50 carats, estimated at 7,000,000 to 10,000,000 CHF during a preview at Christie's in Geneva, Switzerland, Thursday, May 7, 2026.

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'Ocean Dream' blue-green diamond sells for more than $17 million at Christie's auction in Geneva

'Ocean Dream' blue-green diamond sells for more than $17 million at Christie's auction in Geneva

Christie's says a 5.5-carat triangular-cut diamond billed as the largest fancy vivid blue-green diamond known to exist has sold for more than 13.5 million Swiss francs or $17.3 million. The auction house said it was a record for a stone of its kind sold at auction. The “Ocean Dream” was the standout offer at the auction house’s Geneva sale of jewelry on Wednesday. It was found in Central Africa in the 1990s. The price easily topped the presale estimate to fetch 7-10 million francs or around $9-13 million. The buyer was an unspecified private collector.