4) Oppenheimer Blue - $57.5 million

Known in the luxury jewelry world as the 'legendary' diamond. The Oppenheimer Blue weighs 14.62 carats and holds the record as one of the biggest Vivid Blue diamonds to come into an auction house. The diamond received its name from the previous owner and special connoisseur, Sir Philip Oppenheimer. The diamond has a unique rectangular cut that attracted Sir Philip Oppenheimer to it.
Edited by Abhimanyu Sharma