The most expensive pearl ever sold was Marie Antoinette's pendant, which was sold for $32 million at a 2018 Sotheby's auction.
According to reporting from Insider producers Rob Ludacer and Alyssa Pagano, the pearl used to be part of a diamond-studded pendant owned by the former Queen of France.
https://medium.com/@kevinshau/on-leonardo-da-vincis-salvator-mundi-is-it-authent
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