Diamond-shaped facets give the onyx 10x20mm faceted rice beads from Dakota Stones gleaming shine. Available in 8-inch strands, these multi-faceted almond-shaped beads feature a glossy black color that shines with depth. 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 promote vigor, steadfastness and stamina. 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.