From HM's jewel vault flashback: The State Opening of Parliment. Princess Diana attended the state opening of Parliment in and In 1981 and Diana wore The Cambridge Lover's Knot Tiara. She wore the King Khalid Diamond necklace in 1982
Lady Diana wearing a duck egg sized oval Blue Sapphire brooch, given to her by HRH Queen Elizabeth on her engagement to Prince Charles. She later had the brooch converted into the center piece of a multi strand pearl choker.