Classic shape and glinting shine make the onyx 10x14mm faceted oval beads from Dakota Stones come alive. Available by the strand, these beads feature a simple oval shape and diamond-shaped facets cut into the gleaming black 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 said to set one's mind to a task. These beads would look perfect paired with Swarovski mini oval beads.