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Check out this rare, 100-carat diamond

7:52 AM ET Fri, 17 April 2015

A rare 100-carat diamond is being auctioned off at Sotheby's on April 21st where it is expected to fetch upwards of $25 million. CNBC's Robert Frank, and Lisa Hubbard of Sotheby's, provide a sneak peek at the exclusive gem.