The aquamarine, diamond and turquoise necklace worn by Cate Blanchett to the Oscars earlier this year, from the 2015 Tiffany & Co. Blue Book collection.

The aquamarine, diamond and turquoise necklace worn by Cate Blanchett to the Oscars earlier this year, from the 2015 Tiffany & Co. Blue Book collection.

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