Crowning Camilla with the Koh-i-Noor diamond would "bring back painful memories of the colonial past", said India's governing party last night.
According to long established planning for the coronation, the Queen Consort was set to be crowned using regalia including the 105-carat diamond during the Coronation of King Charles III in May next year.
It is not known exactly how much the Koh-i-Noor diamond is worth, but estimates put it at around £120million.