Learn the three Waterford crystal stamps before trying to identify your vase. These are acid etch stamps that authenticate Waterford crystal. The first stamp is a Gothic design, about 1 inch in length, featuring the name "Waterford." This stamp appears on most Waterford crystal manufactured between 1950 and 1999. A second type of stamp might appear in the "cuts" (grooves) of Waterford crystal pieces that have no base, like chandeliers. This stamp has the name "Waterford" in script and is smaller than the Gothic design. A third stamp was introduced in 2000 to commemorate the millennium and to keep counterfeiters from copying the original stamp. This final stamp has the name "Waterford" incorporated into a seahorse logo.
Lift your vase and check the base for one of these stamps.
Check any cuts in the piece for the smaller script stamp if you can't find a stamp on the base. Use a magnifying glass, if necessary. If you still can't find a stamp, check with a Waterford expert or appraiser.