The best selling style, the Round Shell stud is the perfect understated addition to every look. Expertly hammered and light as a feather, they are a little convex to catch the light as you move. Product details Materials: Pewter casting with either 24 kt gold plating / Sterling silver plating / Rose gold plating. Measurements: 0.5" diameter. Earring Closure: Post back. Feather weight: 0.04 oz.