Camilla is to be given the Queen's Mother's priceless 1937 crown, Containing the Koh-i-Noor diamond

Prince Charles changed his coronation vows several years ago to include ‘Queen Camilla’ – with his mother’s blessing, the Daily Mail can reveal.

The insertion of his wife’s title was included as part of a general reworking of plans for the Westminster Abbey ceremony up to five years ago, a senior palace source said.

On Saturday, the Queen announced that the Duchess of Cornwall will become Queen Consort when her husband accedes to the throneIt can also be revealed that Camilla will have the Queen Mother’s priceless platinum and diamond crown placed on her head when Charles is made king. It was created for King George VI’s coronation in 1937.

Yesterday the Prince of Wales made clear his gratitude to the Queen for her support, saying that he and Camilla – who he described as his ‘darling wife’ – were ‘deeply conscious of the honour represented’ by his mother’s wish.

He marked the Queen’s historic Accession Day, heralding the start of her Platinum Jubilee year, by saying her ‘devotion to the welfare of all her people inspires still greater admiration with each passing year’.

Buckingham Palace issued a glorious new photograph of the 95-year-old monarch – sitting in an armchair at Sandringham with her ever-present red despatch box of official papers – to mark her historic 70 years on the throne.

Her father, King George VI, died at the Norfolk residence on February 6, 1952, at the age of 56, leaving his elder daughter as Queen at the age of just 25.

In a highly significant announcement at the weekend, Her Majesty used her unprecedented milestone anniversary to express her desire for her daughter-in-law to be fully acknowledged when Charles succeeds her.

She wrote: ‘When, in the fullness of time, my son Charles becomes king, I know you will give him and his wife Camilla the same support that you have given me, and it is my sincere wish that, when the time comes, Camilla will be known as Queen Consort as she continues her own loyal service.’

It boasts a platinum frame set with 2,800 diamonds, many of which came from Queen Victoria’s Regal Circlet, and contains the Koh-i-Noor (meaning Mountain of Light) diamond, one of the world’s largest and most controversial jewels.

Queen Elizabeth, as she was then, wore the crown to the coronation of her husband George VI in 1937. It now forms part of the Crown Jewels on display at the Tower of London.

The 105.6-carat Koh-i-Noor diamond came into British hands in the mid-19th century as a gift for Victoria. However, many in India believe it was stolen and have demanded it is handed back.

The crown contains a second large diamond, given in 1856 to Victoria by Sultan Abdulmedjid, ruler of the Ottoman Empire, as a gesture of gratitude for British support during the Crimean War.

Made by royal jewellers Garrard & Co, Queen Elizabeth wore the crown but without its arches to the state openings of Parliament during her husband’s reign, and at the coronation of her daughter Elizabeth II in 1953.

The Mail can reveal today that plans to ‘crown’ Camilla as Queen Consort – as opposed to ‘Princess Consort’, as originally planned – have been under way for some time, and Charles came close to announcing it in 2019