Sterling Silver Turquoise Nugget Hook EarringsMaterial: Genuine Sterling Silver (925 silver, 92. 5% silver content) Stone(s): 4 genuine turquoise nuggets Overall Dimension of Each (including hooks): 1. 75 x 0. 5 x 0. 4 inches Back Type: Hook Weight: 5. 4 grams Stamp Mark: N A Serial Number: e25178 Beautiful turquoise is a phosphate mineral popular all over the world. Mined since 5000 BC, it is one of the first gemstones known to be used by humans. Color variation from sky blue to medium green is