Chalcedony, a type of Quartz mineral with a fine-grained texture, includes a variety of gemstones such as Agate, Onyx, Sardonyx, Carnelian, Chrysoprase, Heliotrope, Moss Agate, Chrome Chalcedony, and more.
Celtic knots are based in ancient history dating back 5000 years: symbols of eternal life and hidden meanings
Silvershake 7mm Natural Round Shape Black Onyx White Gold Plated 925 Sterling Silver Celtic Knot Solitaire Ring, is shipped with anti-tarnish protection in reinforced gift boxes & satin-style pouches; guarantee far-outlasting competitors
Onyx, banded chalcedony, has been used for engraving since Roman antiquity; the relief effect of cameos achieved by carving out one level of material and contrasting it against the other behind