Simple and modern 12.5 mm Marble gemstone(synthetic gemstone) is set in a tube setting and sits a top sterling silver band. Size/Dimensions/Weight The size of ring is approx 5, 6, 7, 8, 9, 10, 11, 12 Materials utilized Made from 925 sterling silver. It is safe for most people with sensitive skin - please read my SHOP POLICY about payment, shipping, and refund.