7) The Blue Moon Diamond - $48.4 million

The Blue Moon Diamond was in Sotheby's Geneva possession in 2015. It is on the list of the most expensive blue diamonds in the world. The Blue Moon Diamond weighs 12.03 carats and was brought in from a Cullinan mine. It has been renamed as The Blue Moon of Josephine by a new buyer from Hong Kong.
Edited by Abhimanyu Sharma