Think Titanic's "Heart Of The Ocean" diamond, only real.
Bunny Mellon: two platinum mounted blue diamond pendants. One is an important Fancy Blue diamond, left, and the other a magnificent and rare Fancy Vivid Blue diamond
The Winston Blue, pear-shaped fancy vivid blue flawless diamond
A carat fancy vivid blue, cushion shaped diamond, from the Cullinan mine in South Africa is displayed at Sotheby's auction house. A flawless blue diamond, one of the rarest precious stones in the world.