Since joining the British royal family, Kate Middleton has only worn tiaras on a few occasions. Those appearances have been scrutinized highlights of the royal calendar, but one banquet in November 2023 stands out as the most spectacular. During a state dinner given at Buckingham Palace in honor of South Korean President Yoon Suk Yeol , a rare diadem called the Strathmore tiara was threaded into the hair of Prince William ’s wife.

Queen Elizabeth wearing the Strathmore tiara with King George VI on her wedding day. Hulton Archive/Getty Images

The tiara, composed of diamonds arranged to form a delicate garland of wild roses, had not been worn in public since the 1930s. Purchased from London jewelers Catchpole & Williams, it was presented to the Queen Mother, Elisabeth Bowes-Lyon, by

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