Pierced earrings have been in use off and on since as early as 2500 B.C. For the jewelry collector, it is uncommon to find antique pierced earrings because they had become unpopular by the 1850's and did not regain popularity until the 1970's. At this point they were mass produced in every shape, color and material.
Screw Back Earrings
Screwback earrings have a threaded screw at the back that tightens or loosens to attach/detach the earrings from your ears. These were invented in the early 1900's and were popular until the 1930's when clip-on earrings were invented.
Clip on earrings have a metal spring loaded clip back that fits the earring snugly to your earlobe. This type of earring was popular from the 1930's to the 1970's and is still in use today.