Heavenly colors in this antique necklace of carved dreamy colored casein/celluloid beads. I am referring to them as casein/celluloid because I am not sure which they are. This information from The Bead Collector Network "Casein is not so much a "plastic," as it is an artificial decorative material. Being composed from milk protein (reacted with formaldehyde), casein is actually something like cheese in consistency—though it is much less biodegradable. As such, casein does not have the "plastic" characteristics that we might expect from materials like Celluloid, acrylic, acetate, or other thermoplastics. It does not melt to a liquid, and is not essentially resinous. Casein is usually formed into sheets, and mechanically pressed to form bases for objects. It can be dyed many colors, and is often tooled (rather than being molded) into final shapes. This means we will see some hand-work, that makes beads individualistic and hand-made-looking—including being drilled and textured as surface treatments." The last sentence leads me to believe these are casein. In any case, they are gorgeous! Center bead measures about 3/4" long and the round large beads are 9/16" in diameter. 17 inches long on original sting with matching bead screw clasp.