Shade finial on the bottom appear to be cast iron. Approximately 10.5 inches tall by 8 wide.

  Fitter size

Inside diameter: 3 5/8 inches

Outside diameter: 3 7/8 inches

Shade is in very good condition for it's age.  There is an tiny bit of staining / discoloration on one side that I'm pointing to with a pen in photos.       No chips, cracks or crazing other than the typical minuscule rough edge ones on the fitter.   Cast iron finial is attached securely and has a bit of tarmish.

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