A Tiffany & Co. necklace set a world auction record for a Paraiba tourmaline when it sold for $4.2 million — more than seven times its high estimate — at Christie’s New York.
Sporting a triangular modified brilliant-cut,…

A Tiffany & Co. necklace set a world auction record for a Paraiba tourmaline when it sold for $4.2 million — more than seven times its high estimate — at Christie’s New York.
Sporting a triangular modified brilliant-cut,…