Your looks will shine from every angle when you use the onyx 8x14mm faceted rectangle beads from Dakota Stones. Available by the strand, these beads feature a rectangular shape and diamond-shaped facets cut into the surface for a complex, shining look. 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. Pair these beads with bright colors like yellow or pink for fun, contrasting style.