Vintage 1920s or 30s heavy pressed glass ceiling light shade with embossed floral pattern. There's a little mottled age discoloration to the ecru colored finish, looks lovely, actually. It gives this a softened color effect, like that of antique marble.
This is a little one, just 6" in diameter x 3 1/4" deep, has three holes to be supported by hanging chains beneath the light fixture with the bulb.