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The Princess of Wales was wearing the Diamond and Pearl Leaf Brooch which belonged to the Queen at the service ahead of the lying in state.
The piece features a trio of large pearls set in the centre of a pave-decorated leaf, and had been loaned to Kate by the monarch in the past.
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Kate wore it at the Tyne Cot Commonwealth War Graves Cemetery in Ypres, Belgium, at a commemoration ceremony to mark the centenary of Passchendaele in 2017.
The Queen was seen wearing it on her 73rd birthday in 1999 during an official tour to South Korea.
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The princess was also thought to be wearing pearl drop earrings which belonged to her namesake Diana, Princess of Wales for the service in Westminster Hall on Wednesday.