How rare is Onyx?

Onyx is considered a relatively common gemstone, though its quality and specific varieties can vary. It is often found in volcanic and sedimentary rock formations and is mined in several countries, including Brazil, India, and the United States. While high-quality onyx can be less common and more valuable, the stone itself is not classified as particularly rare compared to other gemstones. Its availability in various colors and patterns also contributes to its popularity in jewelry and decorative items.