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The Duke of Kent's engagement ring is pictured on the finger of his fiancee, Katharine Worsley. It comprises a large sapphire with a single brilliant diamond on each side, mounted in platinum. (Photo by PA Images via Getty Images)

The Duke of Kent's engagement ring is pictured on the finger of his fiancee, Katharine Worsley. It comprises a large sapphire with a single brilliant diamond on each side, mounted in platinum.   (Photo by PA Images via Getty Images)

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Prince Edward, Duke of Kent and his fiancee, Katharine Worsley (later Katharine, Duchess of Kent) pictured together in the gardens of Kensington Palace in London following the announcement of their engagement on 9th March 1961. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

Prince Edward, Duke of Kent and his fiancee, Katharine Worsley (later Katharine, Duchess of Kent) pictured together in the gardens of Kensington Palace in London following the announcement of their engagement on 9th March 1961. (Photo by Rolls Press/Popperfoto via Getty Images/Getty Images)

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Arm-in-arm and smiling happily are the 25 year old Duke of Kent and his fiancee, Katharine Worsley. Miss Worsley is the 28 year old daughter of Sir William and Lady Worsley of Hovingham Hall, near York. (Photo by PA Images via Getty Images)

Arm-in-arm and smiling happily are the 25 year old Duke of Kent and his fiancee, Katharine Worsley. Miss Worsley is the 28 year old daughter of Sir William and Lady Worsley of Hovingham Hall, near York.   (Photo by PA Images via Getty Images)