Mysterious 18th-century diamond necklace — linked to Marie Antoinette's demise — could sell for over $2 million

A mysterious 18th century necklace made from around 500 diamonds, some of which are believed to have been taken from a piece that contributed to French Queen Marie Antoinette's demise, will go on sale in November, Sotheby's said on Monday. 

The piece, from a private Asian collection, will go under the hammer in Geneva on November 11, with online bidding opening on the auction house's website on October 25.

The necklace, which is composed of three rows of diamonds finished with a diamond tassel at each end, will make its first public appearance in 50 years on Monday, and is expected to fetch between $1.8 and $2.8 million.