9) The Winston Blue Diamond ($23.8 million)

This extremely valuable ring features the largest flawless vivid blue diamond in the world. When this stunningly beautiful 13.22 carat piece was auctioned by Christie’s in May 2014, it was bought by Harry Winston, and named in honor of the company’s legendary founder by its CEO, Nayla Heyek. The deal was worth $23.8 million, which exceeded the expectations of the people at Christie’s.