Christie's to auction pink diamond that could fetch $50M

Christie's puts under the hammer next week the largest fancy vivid pink diamond that the famed auction house has ever sold, expecting to fetch $30 million to $50 million for the nearly 19-carat, rectangular-cut gemstone.

A Christie's employee displays an 18.96-carat fancy vivid pink diamond during a preview at Christie's in Geneva, Switzerland, Thursday, Nov. 8, 2018. [Photo: VCG]

The "Pink Legacy" will be the standout offering at Christie's fall jewelry auction in Geneva on Tuesday.

The stone once belonged to the Oppenheimer diamond family, and Christie's says it qualifies as a Type IIa diamond — the most chemically pure stones with little if any nitrogen. It says fancy vivid pink diamonds over 10 carats are "virtually unheard of" in salesrooms.

An 18.96-carat fancy vivid pink diamond is shown on display during a preview at Christie's in Geneva, Switzerland, Thursday, Nov. 8, 2018. [Photo: VCG]

Christie's sale kicks off two days of jewelry auctions in Geneva. On Wednesday, Sotheby's will auction jewelry once owned by French Queen Marie Antoinette that hasn't been seen in public for 200 years.