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A model displays from left to right, the D-Color Diamond Ring of 50.47 Carats by Harry Winston, the Fancy Vivid Yellow Diamond Ring of 20.49 Carats, and the Fancy intense Purplish Pink Diamond Ring of 8.52 Carats, during a Christie's press preview, in Geneva, Switzerland, Friday, May 11, 2018. The D-Color Diamond Ring of 50.47 Carats by Harry Winston is expected to realise 5 to 7 million CHF when it goes for auction in Geneva on May 16. The Fancy Vivid Yellow Diamond Ring of 20.49 Carats is expected to realise 3,8 to 4,5 million CHF when it goes for auction in Geneva on May 16. The Fancy intense Purplish Pink Diamond Ring of 8.52 Carats is expected to realise 3,5 to 5 million CHF when it goes for auction in Geneva on May 16. (KEYSTONE/Jean-Christophe Bott)