This vintage glass shade is an off white translucent glass , often called clam broth as to its variations in color . Popular in the early period of electric lighting as Industrial or service lighting . This particular vintage glass shade is an umbrella shape in the iconic Sheffield ribbed style . featuring a 2 1/4 inch lip fitter , the bottom diameter is 8 3/4 inches and the height is 4 inches . These make obvious pendant shades, how ever , This style of shade can work well on some wall sconces , and chandeliers . These items are indeed vintage nearly 100 years old , are in great condition . No chips or cracks , with the exception of some rough areas around the fitter rims .