Good morning Jonathan,
Thank you for using Mearto for your appraisal inquiry.
Based on the photographs and information provided, and subject to examination, this is:

An Art Nouveau brass, leaded and stained glass lamp shade
Unattributed maker, American or European, early 20th Century
The pierced brass top over leaded shade in tones of blue, green and white.
9 inches high, 6 inches diameter
CONDITION: appears to be in good condition with wear commensurate to age and use
PROVENANCE: inherited
$ 50-75*
*represents a fair-market value for auction purposes; retail or asking price may vary.