GENEVA.- Christie's announces The Ocean Dream, the largest fancy vivid blue-green diamond known to exist and certified by the GIA since the organisation's founding in 1931. Weighing 5.50 carats, the exceptional diamond is fashioned in a striking triangular shape and was extracted from a rough found in Central Africa in the 1990s that weighed 11.70 carat. A stone of this colour and size is extremely scarce, and adding to its rarity the diamond is type Ia, amongst the purest of natural gems. The Ocean Dream will be offered on 13 May 2026 during the Magnificent Jewels auction, to be held at the Four Seasons Hotel des Bergues in Geneva, with an estimate of CHF7,000,000 to 10,000,000.

Max Fawcett, Global Head of Christie's Jewellery, commented: “The Ocean Dream is a gemstone of rare distinction, returning to auction for only the second time in its history. Celebrated by the Smithsonian Institution as one of the eight rarest diamonds in the world, it stands as the largest fancy vivid blue‑green diamond ever recorded. An exceptional jewel of profound rarity and allure, The Ocean Dream is a highlight not to be missed, with previews taking place in Bangkok and Hong Kong, ahead of the auction in Geneva this May.”

The stone previously sold at Christie's Geneva 12 years ago, in May 2014, when The Ocean Dream was purchased for CHF7.7 million.

The first time the world learned of this exceptional stone was during Splendor of Diamonds, a landmark exhibition organised by the Smithsonian Institute's Museum of Natural History in Washington, D.C. in 2003. On view together for the first time were seven of the world's most extraordinary diamonds, representing a rainbow of colours - red, orange, yellow, pink, blue, blue-green and white, exhibited in The Harry Winston Gallery. The selection included The Ocean Dream, described as one of the rarest diamonds known, with no record of any other diamond of this colour and size. All eight diamonds presented in Splendor of Diamonds were discovered after 1980 and included:

The De Beers Millennium Star 203.04 carats
An unnamed diamond 103 carats
The Allnatt 101.29 carats
The Steinmetz Pink 59.60 carats
The Heart of Eternity 27.64 carats
The Pumpkin Diamond 5.54 carats
The Ocean Dream — 5.50 carats
The Moussaieff Red 5.11 carats