The world's most expensive gemstone was sold on Tuesday, April 4th, 2017 at Sotheby's Auction Spring Sell.
The Pink Star, a 59.6ct Fancy Vivid Pink, Internally Flawless, Type IIa diamond fetched $553,000 HKD (Hammer Price including Buyer's Premium) or $71.2m USD, making it the most valuable diamond ever sold in auction and the highest price fetched for any work ever sold in...