What do the terms Taser, Escalator, and Aspirin have in common? They were once protected marks that have become generic. The term “Tiffany” likely has joined their ranks at least with regards to the name of a particular diamond ring setting. The Second Circuit Court of Appeals recently made clear that Tiffany’s 73 trademarks — many registered in connection with jewelry — will not protect it against others using “Tiffany” when that term has become commonly used to describe a particular six-prong diamond ring setting. Thus, anyone — even a discount retailer like Costco — can use it to describe that particular ring setting.