Onyx is a type of chalcedony quartz known for its smooth, black or dark-colored bands or layers. It is often used in jewelry and carvings.

Onyx is believed to provide protection and grounding. It's often associated with enhancing self-control, strength, and emotional balance.

To maintain the sheen of onyx jewelry, clean it with a soft, damp cloth and mild soap. Avoid exposing it to harsh chemicals, extreme heat, or prolonged sunlight.