Shirley MacLaine wears a diamond necklace as a bandeau at the premiere of What a Way to Go in London, July 1964; the press reported at the time that her jewels at the premiere were worth upwards of 50,000 pounds

Ava Gardner wears a tiara for the Primrose League’s Coronation Ball at the Dorchester Hotel in London, June 1953; I don’t have any additional information about the tiara

Audrey Hepburn wears her tiara for the premiere of A Nun’s Story in London, 1959; more on the sparkler, which was sold in 2017, over here!