Sterling Silver Rutilated Quartz Geometric Shape Ring SIZE 7Material: Genuine Sterling Silver (925 silver, 92. 5% silver content) Stone(s): 1 genuine rutilated quartz Ring Face Dimension: 0. 75 x 0. 5 x 0. 4 inches Weight: 6. 1 grams Ring Size (US): 7 Stamp Mark: 925 Serial Number: r29023 Rutile is a crystal form of titanium oxide and ranges from nearly black to golden in color. Transparent quartz showing sprays of thin rutile crystals within has been used in jewelry and ornamentation since ancient times.