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. The 18th century jewel, weighing 300 carats,

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