AP Photo/Mary Altaffer
A Sotheby's employee models a 100-carat emerald-cut diamond, Friday, April 17, 2015, in New York. The "perfect" 100-carat diamond in a classic emerald cut is going on the auction block, where it could fetch between $19 million to $25 million. Sotheby's will offer the white diamond on April 21, in New York.
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