By Amanda Breen Tiffany & Co. is currently selling its most expensive piece of jewelry ever. “The World’s Fair Necklace,” unveiled in Dubai on Sunday, boasts a dazzling 180 carats of diamonds set in platinum. The 578 total diamonds include 353 round brilliant cut stones and 224 custom-cut baguettes. The centerpiece is an 80-carat oval, flawless D-color (highest grade and virtually colorless)

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