With the onyx 18x25mm faceted trapezoid beads from Dakota Stones, black is always in style. Available in 8-inch strands, these asymmetrical trapezoid-shaped beads feature large cut facets that only enhance the shine of their glossy 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 color enhanced to increase its depth of color. 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 banish grief, enhance self-control and stimulate the power of wise decision making. 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.