BOLD Designer Sterling Silver Turquoise Stacked Disc Statement Ring SIZE 10 to 12Material: Genuine Sterling Silver (925 silver, 92. 5% silver content) Stone(s): Genuine turquoise Ring Face Dimension: 1. 25 x 1. 25 x 0. 5 inches Weight: 16. 2 grams Ring Size (US): Adjustable from 10 to 12 Stamp Mark: 925 Serial Number: r26389 Contemporary primitive design by artist Robbin Smith. 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.