Sardonyx has a Sard base, typically of brown or black, with bands of white Onyx running through it. Sard is not Onyx, but rather a dark variety of Carnelian. Sardonyx is sometimes treated to bring out its reddish tones. It is believed by some to improve memory and increase analytical skills.
These are Dakota Stones
Stones are treated with a dye to alter or enhance their color.
4mm round stones
8" strand. Approximately 52 beads
Hole size approximately 0.8 - 1.1mm