Dark glitter defines the onyx 4mm faceted roundel beads from Dakota Stones. Available in 8-inch strands, these tiny rounded beads feature a glossy black color that is only enhanced by the small diamond-shaped facets that cover their surface. Onyx is a variety of chalcedony that is similar to agate, with straight rather than curved bands. Nearly all black onyx on the market has been rendered a uniform, permanent black color with a treatment by sugar and acid or heat. This process has been used on onyx for thousands of years and does not decrease the value of the stone. Mined in Brazil, India and Madagascar, onyx is thought to have protective qualities, especially when traveling. Dakota Stones offers high-quality gemstones that are all useable in jewelry designs because every bead is checked to ensure they are cut and drilled correctly, that the finish is right and that the beads look distinct to their stone type.