Sterling Silver Shell Triangle EarringsMaterial: Genuine Sterling Silver (925 silver, 92. 5% silver content) Stone(s): Genuine shell Overall Dimension of Each (including hooks): 2. 9 x 0. 9 x 0. 2 inches Back Type: Hook Weight: 7. 2 grams Stamp Mark: N A Serial Number: e23697 Contemporary primitive design by artist Robbin Smith. Shells are mineral structures formed by aquatic creatures and land mollusks. Lustrous shells including mother of pearl have been carved into cameos and buttons