Mix it up in your designs with the unique onyx 6mm faceted round beads from Dakota Stones. Available by the strand, these small round beads feature facets cut into the surface for fun dimension and added shine. 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 said to set one's mind to a task. These beads feature a versatile size that can be used in necklaces, bracelets and even earrings.