Turquoise color beads and purple beads with small sterling silver beads in between. Simple but elegant. It is marked 925 on the screw on type clasp. Really lovely and 24 inches long in perfect condition. The beads are cool to touch and a type of stone, but not "turquoise" per se as far as "turquoise rock". More of a translucent look to the polished round beads. The purple stones seem to be of stone as well. I'm just not sure of what kind of stones. Beautiful in color and style.