TOPSHOT - The Pink Legacy, a 18.96 carat fancy vivid pink diamond once owned by the Oppenheimer family, is seen after its sale at Christie's auction house on November 13, 2018, in Geneva, Switzerland. - An exceptionally rare 19-carat pink diamond has fetched USD 50 million (44 million euros) in Geneva on November 13, 2018, setting a new price-per-carat record for a stone of its kind, auction house Christie's said. (Photo by Fabrice COFFRINI / AFP)