This is an Antique Opalescent Victorian Oil Lamp Shade 4” Fitter Art Glass Gas The opalescence of this shade has a faint blue tint to it. It’s unusual with the light blue opalescent glass combination. It has all over cross-stitch type pattern. It measures about 5” tall, 9” diameter overall and is about 4” fitter at the base. It has minor ruffness at the base. Please see all photos