Prince William, Trooping the Colour and Kate Middleton
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Ahead of Saturday's festivities, King Charles III also honored a handful of celebrities and public figures, including David Beckham, Gary Oldman and Elaine Paige.
"Set with diamonds, sapphires, rubies and emeralds, the bejewelled piece features the cypher of her father, King George VI," Zack Stone, a fine jewelry expert from U.K. retailer Steven Stone, shared with WWD.
Senior working royals including Prince William, Kate Middleton, Princess Anne, Prince Edward and Queen Camilla will reportedly take part in the king's birthday parade.
The Duke and Duchess of Edinburgh's son, James, Earl of Wessex, did not join the rest of the Royal Family at Trooping the Colour for the third time. His last appearance at the event came in 2022 when Queen Elizabeth II marked her historic Platinum Jubilee.