Black onyx is a natural gemstone renowned for its striking jet-black color and smooth, glossy finish and is formed from layers of chalcedony and quartz. With its deep color symbolizing strength and protection, black onyx has long been prized for its metaphysical properties, believed to ward off negative energies and promote inner harmony.

While Black Onyx is the most commonly recognized variety, it can sometimes exhibit white bands or layers, resulting in a stone known as banded black onyx. This variation is often used in jewelry for its striking contrast.