A "perfect" 100-carat diamond in a classic emerald-cut could fetch between $19 million to $25 million at auction.
"This 100.20-carat diamond is the definition of perfection. The color is whiter than white. It is free of any internal imperfections," Sotheby's New York jewelry department head Gary Schuler said in a statement, likening its transparency "to a pool of icy water."
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