* Astronomy

World's Biggest Round Blue Diamond May Fetch $19 Million

The world's biggest round "fancy vivid" blue diamond is estimated to sell for more than $19 million at an auction in Hong Kong in October.
The brilliant-cut internally flawless stone, weighing 7.59 carats, will be auctioned by Sotheby's (BID) on Oct. 7 as part of the company's 40th anniversary sales in Asia, according to an e-mailed release from the New York-based auction house.
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