Sotheby’s Diamonds

When the Hutton–Mdivani jadeite necklace comes to Sotheby’s Magnificent Jewels and Jadeite sale in Hong Kong on April 7, it is expected to set a new world record for jadeite at auction.
James de Givenchy, designer for Sotheby’s Diamonds (212.894.1400, www.sothebysdiamonds.com ) , fashions avant-?garde jewelry using some of the world’s best diamonds. This year he continues to...