Van Cleef Diamond Necklace Worth Millions Stolen from Vienna Museum
Jewel was from the collection of Queen Nazli, former queen mother of Egypt.
Trade group shakes up executive committee and board of directors.
Rise in gold price supported investment demand during second fiscal quarter.
Company taps internal talent, also appointing chief operating officer Belit Myers as president.
17.66-carat stone will feature at Magnificent Jewels auction in New York.
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