Chalcedony, a fine–grained cryptocrystalline Quartz mineral, offers-up a pantheon of gemstone varieties; Agate, Onyx, Sardonyx, Carnelian, Chrysoprase, Heliotrope, Moss Agate, Chrome Chalcedony etc Victorian inspired silver jewelry; antique English styles from 1830s to 1890s which influenced the world Silvershake Genuine Black Onyx 925 Sterling Silver Victorian Style Rope Ring, is shipped with anti-tarnish protection in reinforced gift boxes & satin-style pouches; guarantee far-outlasting competitors If there is 'One' black gemstone that oozes sophistication, it's Onyx, a Black Agate, Chalcedony variety of Quartz Silvershake Genuine Black Onyx 925 Sterling Silver Victorian Style Rope Ring Size 6