It is a modern costume jewelry earring.
Richelieu is name for Joseph H. Meyer Bros Co. A company known for working in costume jewellery since early 1900s. They often made jewellery incorporating pearls in to the many items of jewellery they produced. They did create all types of costume jewellery using rhinestone and almost all other material.
Joseph H. Meyer & Bros, Brooklyn NY was founded in 1911 producing Richelieu costume jewelry for men and women specializing in designing jewelry using simulated creamy to colored pearls, small faux pearls, and rhinestones with spacers between the stones and with goldtone metal bases. Some of the pearl necklaces produced contained beautiful ornamental pearls and rhinestones on the clasp or as an added design feature on the necklace. Mark: Traynor for Richelieu", Treza", Richelieu Satinore", Richelieu Indelle", Richelieu Pearls", "Ingeborg-Sant Angelo for Richelieu" 1967, "RCHL with a 2 letter number". The newer costume jewelry made is said to be better designed than some of the older pieces. Lisner-Richelieu Corp. is still producing jewelry and it is now marked: "Richelieu". The Richelieu costume jewelry symbolizes the beautiful simulated look of real pearls of the highest quality with stylish designs using gold plating, silver plating and platinum as the base metal. The Richelieu costume jewelry is not highly collectible today but is gaining popularity because of its outstanding distinctive designs.