The infamous crown was made especially for the Queen Mother’s 1937 coronation and features the controversial Koh-i-noor diamond, which was seized by the East India Company and given to Queen Victoria in the 19th century. Critics say its appearance would provide an unwelcome reminder of the British Empire.

Palace officials are understood to be reviewing whether Camilla should wear the jewel – which has been worn by consorts including Queen Alexandra and Queen Mary – when she’s crowned alongside King Charles III at Westminster Abbey in May 2023.

Fine jewellery experts at UK retailer Steven Stone have taken a close look at the crown, revealing everything you need to know – including its value.

The 105.6 carat Koh-i-noor diamond sits in the front cross-pattee in a detachable platinum mount and is said to be worth $591 million alone
The crown features 2203 brilliant-cut and 662 rose-cut diamonds
Our experts estimate the crown to be worth $1 billion
The King and Queen Consort may opt to use the crown with the diamond removed, or use a different, simpler option from the Royal Collection
Maxwell Stone commented: “It’s incredibly difficult to put a price on a historical piece like this – though with the Koh-i-noor diamond said to be worth $591 million alone, the crown is likely to be worth a staggering $1 billion.

Boasting 2203 brilliant cut and 662 rose cut diamonds, the crown is a particularly delicate piece. Known for their sparkle, brilliant diamond diamonds are fairly common, whereas rose cut diamonds are much rarer – sitting closer to the skin than their taller counterparts, rose cut diamonds allow light to move through the stone, resulting in a more transparent glow and subtle shine.

With a wealth of controversy surrounding the diamond, it’d be surprising to see it used in the coronation ceremony. The Royal Collection is full of magnificent jewels, so it’s likely that the King and Queen consort will remove the diamond and replace it with a different gem.”