PHOENIX - Police have arrested a Mesa woman accused of stealing diamond rings at Costco stores across the Phoenix metropolitan area and swapping them out with fake ones. Keisha Joice is suspected of ...

One thing you may have never expected to find at Costco — a place where we commonly go to stock up on things like paper towels and peanut butter pretzels — is a stunning collection of jewelry, ...

NEW YORK (Reuters) - Costco Wholesale Corp (NASDAQ:COST) willfully infringed Tiffany & Co's trademarks by selling counterfeit diamond engagement rings bearing the luxury retailer's name and must face ...

A federal jury told Costco to pay Tiffany and Co. $5.5 million in compensation for selling counterfeit Tiffany diamond engagement rings. Last year, a district judge ruled that Costco had knowingly ...