NEW YORK ( TheStreet) -TheStreet Ratings' stock model upgraded Harry Winston Diamond Corp ( HWD) to 'Hold' from 'Sell'. Net income at this $909 million market cap, diamond mining and retailing specialist rose to $16.5 million in the second quarter of 2010, ending July 31, from a loss of $24.5 million in the same quarter last year.

TheStreet Ratings released rating changes on 14 additional U.S. common stocks for September 1, 2010. In total, eight stocks were downgraded and seven stocks have been upgraded by our stock model.

Revenue at Harry Winston Diamond Corp jumped by 62% to $154 million in the second quarter, from the same quarter one year earlier. Learn more about Harry Winston Diamond: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

Heading the other direction, being downgraded to 'Hold' from 'Buy', is Bridgford Foods Corp ( BRID - Get Report). The stock of this $114 million market capitalization, food producer & distributor, has lost a quarter of its value since late June. At SIFCO Industries, fiscal third quarter revenue was flat while the company report its first quarterly loss of $760 thousand since the first quarter of 2008. Learn more about Bridgford Foods: Company Profile, Income Statement, Balance Sheet, Stock Ratios, Analyst Ratings.

-- Reported by Kevin Baker in Jupiter, Fla.

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Kevin Baker became the senior financial analyst for TheStreet Ratings upon the August 2006 acquisition of Weiss Ratings by, covering mutual funds. He joined the Weiss Group in 1997 as a banking and brokerage analyst. In 1999, he created the Weiss Group's first ratings to gauge the level of risk in U.S. equities. Baker received a B.S. degree in management from Rensselaer Polytechnic Institute and an M.B.A. with a finance specialization from Nova Southeastern University.