Geometric style is filled with classic color in the onyx 8mm faceted square beads from Dakota Stones. Available by the strand, these beads display a square shape and diamond-shaped facets cut into the surface. Each facet creates even more gleaming shine for the black color of the bead. 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 beautiful in bracelet and necklace ideas along with Swarovski crystal.