The color of onyx can vary, but it is often associated with black. Black onyx is the most well-known variety and is prized for its deep, glossy black hue. However, onyx can also come in various other colors, including shades of brown, gray, white, and even red or green. The term “onyx” is typically used to describe chalcedony with alternating bands of different colors, but when it’s referred to as simply “onyx,” it’s often assumed to be black. Onyx’s wide range of colors makes it a versatile gemstone for use in jewelry and decorative art, and it’s often used for cameos, beads, and cabochons due to its attractive and varied appearance.