New Delhi: A supremely rare pear-shaped 15.38 carat pink diamond, called the 'Unique Pink', sold for USD 31.6 million at Sotheby's in Geneva, making it the most expensive fancy vivid pink diamond ever to sell at an auction.

A model shows the 'Unique Pink' a rare and exceptional Fancy Vivid Pink diamond weighing 15.38 carats during a press preview by Sotheby's auction house on May 9, 2016 in Geneva. Pic/AFP