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Margot Robbie: $1.9 million
Margot Robbie wore a vintage Van Cleef and Arpels necklace to the 2015 Oscars. It was made in 1938 for the Duchess of Windsor, and comprised of 150 diamonds and 300 sapphires. The 18-carat-gold necklace is valued at $1.9 million and took 600 hours to create.