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UNITED STATES - JUNE 05: A diamond necklace, estimate $350,000-$520,000, is displayed at Christie?s Auction House in New York, Monday, June 5, 2006. More than 90 pieces of jewelry that belonged to the late Princess Margaret will be auctioned off in London to help pay her son?s, Lord Linley, inheritance tax. (Photo by Timothy Fadek/Bloomberg via Getty Images)

UNITED STATES - JUNE 05:  A diamond necklace, estimate $350,000-$520,000, is displayed at Christie?s Auction House in New York, Monday, June 5, 2006. More than 90 pieces of jewelry that belonged to the late Princess Margaret will be auctioned off in London to help pay her son?s, Lord Linley, inheritance tax.  (Photo by Timothy Fadek/Bloomberg via Getty Images)