At the 2016 opening of Parliment, Duchess Camilla donned her most loved bejewelled accessory, the Greville Tiara.  It was made a well-known socilatie Mrs. Greville back in 1921, out of stones salvaged from another tiara. Having no heirs of her own, she left her considerable jewel collection to the then-Queen Elizabeth (the future Queen Mother) when she died in 1942.
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