This is a Steuben Art Glass Calcite & Gold Aurene Iridescent Lamp Shade. IT measures 4 ¾ inches tall and 5 inches wide at its broadest point, the shade has a gently flared silhouette with elegant vertical ribbing. The top opening is just under 2 ¼ inches across, suitable for a variety of antique lamp fittings. Though unsigned, the craftsmanship and materials are consistent with Steuben’s work from the early 20th century, and many identical signed examples are pictured on the internet.