Kate Winslet wore it on screen, Celine Dion rocked a $2.2 million real version. Titanic's storied blue gemstone (which is not at the bottom of the sea) also boasts a connection to Princess Diana ...
A 300-carat necklace, whose diamonds have been linked to a scandal involving the last French queen Marie Antoinette, sold Wednesday for nearly $5 million at a Sotheby's auction in Geneva.
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