Charles Albert Sterling Silver, Blue Chalcedony Button EarringsMaterial: Genuine Sterling Silver (925 silver, 92. 5% silver content) Stone(s): 2 pieces top grade authentic blue chalcedony Overall Dimension of Each (including hooks): 1. 4 x 0. 75 x 0. 25 inches Back Type: Stud Weight: 12 grams Stamp Mark: Charles Albert, Fine Sterling Silver Serial Number: e12075 Charles Albert, Fine Sterling Silver; Chalcedony is the general name for a variety of colored quartzes, many of which have a creamy appearance and