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A model displays from left to right, the Fancy intense Purplish Pink Diamond Ring of 8.52 Carats, the Fancy Vivid Yellow Diamond Ring of 20.49 Carats, and the D-Color Diamond Ring of 50.47 Carats by Harry Winston, during a Christie's press preview, in Geneva, Switzerland, Friday, May 11, 2018. 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. 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 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. (KEYSTONE/Jean-Christophe Bott)