7) Hutton-Mdivani Jadeite Necklace by Cartier ($27.44 million)

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This magnificent necklace is valued at $27.44 million. It is made of 27 large jadeite beads of amazing color, whose diameters range from 15.4mm to 19.2mm. This once belonged to the famous socialite Barbara Hutton, daughter of retail tycoon Frank W. Woolworth. It is mounted by Cartier with a beautiful ruby and diamond clasp.