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 ...

Costco Wholesale and Tiffany and Co. agreed to settle a long-running lawsuit over the warehouse retailer’s sale of “Tiffany” diamond engagement rings. The fabled jewelry store chain first sued Costco ...

Costco had been accused of trademark infringement and counterfeiting in a lawsuit for using the "Tiffany" name in selling of diamond engagement rings.

NUTLEY, N.J. (AP) — Authorities say a woman stole a $28,000 diamond ring from a New Jersey Costco store by replacing it with a much cheaper ring she had stolen from a different Costco. Izaebela Kolano ...