The Native American Blet buckle does not have a silver mark but was tested with nitric acid to be solid sterling silver and weighs 81.1 grams. It does have the artist makers mark "EF". It measures 3 3/8" x 2 3/8". It will accommodate up to a 1 3/4" belt. On the front are two large claws that are 2" long. The natural turquoise measures 1 1/2" x 1 1/8" It has two stress lines . One near the top and one near the bottom. They look like matrix lines . The artist stabilized the lines.