An art deco-style emerald necklace from the collection of American socialite Helene Beaumont and a 36.57-carat near-flawless diamond shared the spotlight at Sotheby's Magnificent Jewels and Noble Jewels sale in Geneva yesterday. These top two items sold for $3.6 million and $5 million, respectively, accounting for more than 20% of the auction's total sales of […]