Onyx is highly sensual, the shine of sterling silver the perfect contrast; Head-turning jewelry! Pendants with Celtic basic knots, from the Celt culture, date back over 2,500 years before Christianity Silvershake 1.58ct. Natural Black Onyx 925 Sterling Silver Celtic Knot Pendant with 18 Inch Chain Necklace, 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 1.58ct. Natural Black Onyx 925 Sterling Silver Celtic Knot Pendant with 18 Inch Chain Necklace