Princess Margaret and Princess Anne also donned the beautiful tiara at a very young age.

Charlotte White, head of design at 77 Diamonds, which is headquartered in Mayfair and is Europe’s largest online diamond jeweller, explained: “Most Royal Family members have worn a tiara for the first time on their wedding day, for example, Charlotte’s mother the Duchess of Cambridge, and Prince William’s first cousins Princess Eugenie and Princess Beatrice.

“Exceptions to this general rule have been Princess Anne and Princess Margaret who both wore tiaras on occasions prior to their weddings.

“Princess Anne wore a tiara when she was 17 for an official royal portrait.