Hi Becky,

Thank you for contacting Mearto with your appraisal inquiry.
Lots of companies copied the bronze and glass lamps that Louis Comfort Tiffany, Tiffany & Co., or Tiffany Studios made in the first two decades of the 20th Century; only those that are marked (typically on the shade AND the base, usually in very discrete and not-easily visible places like the underside of the base or the upper rim of the shade) by Tiffany bring good money (a few thousand dollars to several hundred thousand dollars) so before I provide an estimate I need to know if yours is marked or not (and if so, a photograph or two of those marks is very helpful).
I will also need to know the overall height and the diameter of the shade.

Thanks to let me know!
Delia