Sardonyx is a variety of onyx that typically comes in shades of red (the word "sard" means "red"). Our selection of sardonyx beads are dark, and mainly display shades of black, dark brown, dark red, and cream. Some look very similar to black onyx or black banded agate. These sardonyx semiprecious beads display beautiful patterns, including bands, stripes and swirls! Onyx is purported to help eliminate apathy, stress, and negative thinking. It is also said to sharpen wits, increase concentration, and prevent absentmindedness. Onxy is sometimes worn to help public speaking since some people think it makes the wearer more eloquent. Get these sardonyx gemstone beads while you can - they are all limited to stock on hand!