A model displays both a 100.20 carats (L) and a 25.59 carats, that is known as “The Sunrise Ruby”, diamond rings at a pre-auction viewing at Sotheby's in Hong Kong April 3,2015. According to a press release by Sotheby's, the 100.20 carats diamond, described as “internally flawless” by Sotheby's, is expected to fetch between $19-25 million in a New York auction on April 21, 2015. The Burmese cushion-shaped ruby diamond “The Sunrise Ruby”, mounted by Cartier as a ring, is expected to fetch between $12-18 million in Geneva on May 12, 2015. (Photo by Tyrone Siu/Reuters)
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