Let the elegant shine of onyx ornament your designs when you use the onyx 10x20mm faceted double drilled rectangle beads from Dakota Stones. Available in 8-inch strands, these rectangular beads with smooth, rounded edges feature a glossy black color that twinkles with shine thanks to the diamond-shaped facets cut into their surface. These beads have two drilled stringing holes, making them perfect for use in watch bands. 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 believed to have protective energies since black is the absence of light and therefore can be used to create invisibility. 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.