Christie's to auction largest fancy vivid blue-green diamond
Christie's will offer The Ocean Dream, the largest fancy vivid blue-green diamond ever recorded, on 13 May 2026 during the Magnificent Jewels auction at the Four Seasons Hotel des Bergues in Geneva. Weighing 5.50 carats, the triangular stone was cut from an 11.70-carat rough found in Central Africa in the 1990s. Certified by the GIA since its founding in 1931, the diamond is type Ia, among the purest natural gems. Its estimate is CHF 7,000,000 to 10,000,000. The Smithsonian Institution has recognized it as one of the eight rarest diamonds in the world. Max Fawcett, Global Head of Christie's Jewellery, noted it returns to auction for only the second time.
Key facts
- The Ocean Dream is the largest fancy vivid blue-green diamond known to exist.
- The diamond weighs 5.50 carats and is fashioned in a triangular shape.
- The rough stone weighed 11.70 carats and was found in Central Africa in the 1990s.
- The diamond is certified by the GIA, which was founded in 1931.
- The diamond is type Ia, among the purest natural gems.
- The auction will take place on 13 May 2026 at the Four Seasons Hotel des Bergues in Geneva.
- The estimate is CHF 7,000,000 to 10,000,000.
- The Smithsonian Institution lists it as one of the eight rarest diamonds in the world.
Entities
Institutions
- Christie's
- GIA
- Smithsonian Institution
Locations
- Geneva
- Switzerland
- Central Africa