8) The Wittelsbach-Graff Diamond ($24.3 million)
Prestigious gemstone Wittelsbach-Graff Diamond has a history which goes as far back as the 17th century. It was part of the Bavarian crown jewelry before disappearing for decades during the 20th century. When it reappeared it was bought by legendry jeweler Laurence Graff for around $24.3 million in an auction.
7) Hutton-Mdivani Jadeite Necklace by Cartier ($27.44 million)
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.
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