From Inside Edition.

It’s a once in a lifetime buying opportunity, if you have deep pockets. A nine and a half carat blue diamond is being auctioned off by Christie’s in Geneva next month. It’s called the Mellon Blue, named after its original owner, Rachel Mellon. The diamond was last seen publicly back in 2014 when it was up for auction and has since been set in a band to create a ring. Inside Edition Digital’s Mara Montalbano has more.