Tiffany style lamp looks to be made of copper and or brass. Shade is 19” diameter. The stand was in pieces so I took pictures of it before assembling (Still trying to figure out how to put it back together). Has all of the original parts and pieces.
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If this is a bronze base, it will be quite heavy to support/balance a leaded and slag-glass shade; brass is much lighter and not worth quite as much and would support a stained glass shade (which is what your shade looks like). If this was made by one of the more important makers, it will be signed or marked on both the base and shade - I don't see anything in the photos but these can be tiny so if you see something let me know (and take a photo if you can and I'll update this as necessary.)
Based on the photos and information provided, and subject to examination, this is:
An American Victorian Style stained glass and ebonized brass table lamp
Unattributed maker, early 20th Century
With cherub finial, brass standard and stepped and footed square base, the conical shade with stylized tulip decoration against a geometric ground.
(height); shade 19 inches diameter
*represents a fair-market value for auction purposes; retail or asking price may vary.