Seventh on this list of most expensive diamonds is The Wittelsbach - Graff Diamond, worth $23.4 million.
Again, this is a fancy deep blue diamond with an internally flawless grading. Well, you'd expect at least that for over $23 million.
This stunning diamond is thought to originate from the mines of the former Indian kingdom of Golkonda - exotic indeed.
The diamond is also know as Der Blaue Wittelsbacher and weighs 7.11 grams and 35.56 carats.
The diamond was purchased by Laurence Graff, a London based jeweller, from a diamond sale at Christies in London, United Kingdom.