How do I tell if a vase is a Tiffany vase?

There are a few ways to initially check if a vase is a Tiffany vase. Check the base of a vase for a mark or initials from the maker. The iridescent quality of Tiffany glass is crafted into the glass, rather than sprayed or painted on, so any marks where the iridescence has rubbed off would indicate that a vase is not an authentic Tiffany piece. To be sure if a vase is a Tiffany vase, it is best to have a professional evaluate it. Shop a range of expertly vetted Tiffany vases on 1stDibs.