French Jewelry designer Henry Perichon (aka Henry) designed these lovely clip-on earrings in the 1960s. The rounded gilt-metal shape is inspired by Baroque and Medieval design and is adorned with pearl-like, square agate-like gemstones and crystal-clear rhinestones. Each earring is signed Henry on the underside. 
 
Note: Henry Perichon (1910 - 1970), known as "Henry," was one of the most inventive jewelry designers of the period. His studio was in Lyon, working in media such as bronze, silver, white metal, or resin (Talosel); his style is hard to define, reflecting many influences, including Ancient, Medieval, Renaissance, Baroque, and Art Deco. Many famous actresses from the 1950s and 1960s, such as Claudette Colbert, Suzanne Flon, Michele Morgan, and Edwige Feuillère, wore his jewelry on stage and in real life.