Onyx is a dramatic yet affordable gemstone. Onyx is said to eliminate negative thinking. Onyx is also believed to sharpen the wits of the wearer and bring spiritual inspiration. Although onyx comes in a variety of colors, black is the most common color used in onyx jewelry. Onyx jewelry is striking and unexpected, especially when set in a contrasting silver setting. Onyx can be cut like other gemstones or carved into beads or unusual shapes. Depending on the treatment, onyx jewelry ranges from regal to playful.