This is a vintage, mid 20th century, about 1960s, Egyptian inspired, Cleopatra style bib necklace. The necklace does not appear to have a maker mark or may have had a maker charm attached at some point. It is likely American-made. The material is mother of pearl with likely colored glass beads on a gold tone linked chain. The 1963 movie, Cleopatra, starring Elizabeth Taylor, saw a re-surgence in Egyptian Revival costume jewelry. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.