Aline Sylla-Walbaum, global managing director of luxury at Christie's; an early 19th-century sapphire and diamond necklace during a press preview ahead of sales by Christies's in Geneva, Switzerland. Christie's; Getty Images.
Aline Sylla-Walbaum, global managing director of luxury at Christie's; an early 19th-century sapphire and diamond necklace during a press preview ahead of sales by Christies's in Geneva, Switzerland. Christie's; Getty Images.

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