Your designs will be bold and elegant with the Dakota Stones matte onyx 18x25mm faceted trapezoid beads. Available in 8-inch strands, these beads feature deep black color and a matte finish for a soft gleam. These beads feature large, asymmetrical trapezoid shapes. This material has been rendered a uniform and permanent black color with a treatment of sugar and acid. This process has been used on the gemstone for thousands of years and is water safe. These beads are polished and then tumbled to achieve the matte finish. Mined in Brazil, India and Madagascar, onyx is said to enhance steadfastness and determination, setting one's mind to a task. Use these beads in bold, geometric designs with lots of bright colors.