Geneva, 24 April 2026 - Christie's announces The Ocean Dream, the largest fancy vivid blue-green diamond known to exist and certified by the GIA since the organization'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 color and size is extremely scarce, and adding to its rarity the diamond is type Ia, among 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 Jewelry, 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 organized 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 colors, 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 color and size. All eight diamonds presented in Splendor of Diamonds were discovered after 1980 and included:
(Press Release)
