A rare diamond necklace with possible links to former French queen consort Marie Antoinette is to be auctioned in November with a price estimate of up to $2.8 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 Marie Antoinette's demise, will go on sale in November,

A rare antique diamond necklace worn at two British coronations is expected to sell for more than £1 million at auction. The 18th-century diamond piece of approximately 300 carats was worn at King George VI and Queen Elizabeth II’s coronations by members of the Marquess of Anglesey family,

A mysterious 18th century necklace made from around 500 diamonds, some of which are believed to have been taken from a pie