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 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 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,

The 18th century diamond jewel of approximately 300 carats was worn to King George VI and Queen Elizabeth II’s coronations.