NEW YORK (AP) — It's just the thing for your special someone. A "perfect" 100-carat diamond goes up for auction today. Sotheby's says the classic emerald-cut gem could bring up to $25 million. It's an internally flawless D color stone, which the auctioneer says is considered "perfect." One Sotheby's expert says the stone's transparency is like "a pool of icy water."

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