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. (Jean-Christophe Bott/Keystone via AP)

Sotheby’s Deputy Chairman, Middle East & Head of Sotheby’s UAE, Katia Noun Boueiz wears the Mediterranean Blue diamond during its worldwide debut in Abu Dhabi, United Arab Emirates, Tuesday, April 8, 2025. (AP Photo/Altaf Qadri, file)

GENEVA (AP) — A 5.5-carat triangular-cut diamond billed as the largest fancy vivid blue-green diamond known to exist sold for more than 13.5 million Swiss francs ($17.3 million) on Wednesday, Christie’s said, calling it a record price for a stone of its kind sold at auction.

The “Ocean Dream,” the standout offer at the auction house’s Geneva sale of jewelry, was found in Central Africa in the 1990s. The price easily topped the presale estimate to fetch 7-10 million francs (around $9-13 million).

Rahul Kadakia, president of Christie’s Asia Pacific, said that an unspecified private client was the buyer, and the stone took about 20 minutes to sell — an indication that interest was high.