The Diplomatic Corps Reception is arguably the most highly anticipated annual event on the royal calendar. The white-tie affair is one of the few times during the year the ladies in the family don the spectacular royal jewels — and Queen Camilla sparkled in the late Queen Elizabeth II’s rarely seen Aquamarine Ribbon Tiara

The Princess of Wales attended the Ceremonial Welcome at Horse Guards Parade, wearing one of the late Queen's most iconic pieces of jewelry.

Queen Elizabeth and Princess Kate aren’t the only British Royals who had a penchant for these jewels, however. In 1982, the Queen loaned both the choker and earrings to Princess Diana for a State Visit at Buckingham Palace. Kate also paid homage to Diana on Tuesday by wearing her sapphire ring which was a gift from William upon their engagement.

As Buckingham Palace confirms Camilla was suffering from a form of pneumonia, the Waleses step up to kick off the state visit.

Queen Camilla, who is recovering from pneumonia, posed for photos with the Amir of Qatar alongside King Charles on Tuesday, Dec. 3, before the royal family hosted a state banquet for the guests of honor.

Kate Middleton has a busy day today as she returns to a fuller royal schedule after undergoing chemotherapy earlier this year. This morning, the Princess of Wales joined her husband, Prince William, for a ceremonial welcome to kick-off to the two-day visit of Emir of the State of Qatar,

Princess Diana's wedding will forever go down as one of the most memorable moments in British royal history. An estimated 750 million people tuned in globally to watch her tie the knot with then-Prince Charles on July 29,