Сoach cover earrings

Hidden beauty.
Earrings in coach covers with clasps were popular in the 1870s and 1880s.
Snap-on earring covers were an American innovation, and were generally made with black enamel or inconspicuous gold ornamentation.
Coach cover earrings were also called “Opera covers” ones, as the covers protected (hidden from prying eyes) diamonds on the way to the opera, to a ball or when entering the high society.