Worn at Queen Elizabeth II’s coronation, the necklace has possible links to the downfall of Marie Antoinette

A mysterious diamond-laden necklace with possible links to a scandal that contributed to the downfall of Marie Antoinette has sold for $4.8m (£3.8m) at an auction in Geneva.

The 18th-century item of jewellery containing approximately 300 carats of diamonds had been estimated to sell at the Sotheby’s Royal and Noble Jewels sale for $1.8-2.8m.