The Cartier sapphire and diamond necklace displays a precise geometric form and is an exceptional example of the Art Deco pieces for which Cartier is famed. Image: Courtesy Hillwood Estate, Museum and Gardens

The Cartier sapphire and diamond necklace displays a precise geometric form and is an exceptional example of the Art Deco pieces for which Cartier is famed. Image: Courtesy Hillwood Estate, Museum and Gardens.

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