Add sophistication to your large-hole jewelry with the sardonyx 8mm large-hole round beads from Dakota Stones. Available by the strand, these gemstone beads will amaze and delight with their innovative design. Each bead features a wide stringing hole, perfect for using with thicker stringing materials like leather cord. In fact, these beads are temporarily strung on leather cord. These perfectly round beads feature black color striped with unique white patterns. Sardonyx, also known as tuxedo agate, is believed to improve memory and increase one's analytical talents.