The onyx 8mm faceted round beads from Dakota Stones glitter darkly from every angle. Available in 8-inch strands, these rounded beads feature a glossy black color that is only enhanced by the small hexagonal 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. Onyx is mined in Brazil, India and Madagascar and the ancient Romans associated it with courage as it was thought to be useful when defending oneself against criticism. 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.