T&C Exclusive: Bunny Mellon's $20 Million Dollar Rare Blue Diamond is Coming up for Auction.

T&C Exclusive: Bunny Mellon's $20 Million Dollar Rare Blue Diamond is Coming up for Auction.

The Christie's Sale, which will take place in Geneva, is expected to fetch $20 million.

Christie’s Gives Mellon Blue Diamond $30M Price Tag

A blue-diamond ring will headline an upcoming auction at Christie’s in Geneva, where it is expected to fetch up to $30 million. The piece, called the Mellon Blue, contains a pear-shaped, 9.51-carat, fancy-vivid-blue, internally flawless diamond, Christie’s said Friday. It will feature in the November 11 Magnificent Jewels sale. Having previously been set in a pendant, the jewel belonged to Rachel Lambert Mellon — better known as Bunny Mellon — a…