The ‘Ocean Dream’ has become the most expensive fancy vivid blue-green diamond ever sold at auction

British international auction house Christie’s sold a rare blue-green diamond known as the ‘Ocean Dream’, which was found in Central Africa, for more than $17.3 million at its Magnificent Jewels sale in Geneva on Wednesday.

The auction house said the 5.5-carat diamond is the largest fancy vivid blue-green diamond ever certified by the Gemological Institute of America. It exceeded its presale estimate of $8-12 million. It was cut from an 11.70-carat rough stone found in the 1990s.

The gem was shaped into a triangular cut that preserved much of the original rough diamond.

Christie’s said the diamond attracted strong bidding before an unnamed private collector bought it. The bidding lasted around 20 minutes.…