These pieces are usually stamped with "Tiffany Studios" on the lamp's base, but beware of forgeries. In December 2018, Christie's auctioned off a rare 1903 "Pond Lily" table lamp for $3,372,500.

and the lamp, I'm going to cry probably...the refrigerator was on the side washed in another room. We had 14 feet of water. The Tiffany stood in a room, did not get knocked off the table ...