The world’s largest orange diamond is expected to sell for up to $20 million when it is auctioned by Christie’s in Geneva, Switzerland.

A preview of the auction, which also will include an emerald necklace worn by Princess Pfizer of Egypt and a brooch owned by Eva Peron took place in New York last Friday.

The world’s largest orange diamond is expected to sell for up to $20 million

“The orange diamond is rare primarily because of its size. At 50 carats it’s the largest vivid orange diamond in the world that’s ever come up for sale at auction,” said Christie’s representative Rahul Kadakia.

The Christie’s sale includes some of the rarest gems, and jewels from the impressive period.

Christie’s says the pear-shaped Orange diamond is expected to sell for up to $20 million when it is auctioned by Christie’s in Geneva, Switzerland on November 12.

Other items such as a Cartier emerald and diamond necklace are expected to sell for up to $10 million.

[youtube pYLLgyFbjoY]