A Christie's employee displays "Le Grand Mazarin," a legendary 19.07-carat pink diamond during a preview at Christie's, in Geneva, Switzerland, Wednesday, Nov, 8, 2017. A 19-carat pink diamond that once belonged to King Louis XIV, Napoleon Bonaparte and other French rulers is going up for auction and is estimated to sell for 6 -9 million US dollars. (Martial Trezzini/Keystone via AP)