Hi April,

Thank you for contacting Mearto with your appraisal inquiry.
The most likely scenario is that this is not made by Louis Comfort Tiffany, Tiffany & Co., or Tiffany Studios but by any of at least a half-dozen companies that emulated their wares in the early decades of the 20th Century. If I were able to examine this in person, I would look for stamped marks - usually on the brass rims - that would identify the maker. Because I can't examine it, and because of the significant likelihood that this is NOT by Tiffany, I am calling it "Tiffany Style." If, at some point, you are able to examine it for marks and find Tiffany marks, please let me know as the value on this would be considerably higher.
Based on the photos and information provided, and subject to examination, this is:

A vintage Tiffany Style leaded glass inverted dragonfly chandelier shade
unattributed maker, first half 20th Century
The domed shade with inverted dragonfly decoration, against a foliate background.
(DIMENSIONS)
CONDITION: appears to be in generally good condition; value assumes no chips, breaks, losses or repairs.
PROVENANCE: came with a house purchase
$400-600*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.