Tiffany & Co: "Costco sells counterfeit rings"
(CNN) — If you bought your Tiffany engagement ring at Costco and think you got a "deal," Tiffany says, think again.
The jewelry company says its rings have never been sold at the wholesale club.
It's suing Costco for counterfeiting, false advertising and deceptive business practices.
No response yet from Costco.