Earring jackets are posts that contain three elements: the stud post itself, the earnut to close, and a third hooped piece that can be threaded through the post and worn behind the earlobe, thus "jacketing" the lobe. Earrings may also be worn simply as the stud sections alone. Sterling silver.
 
Styles:
Trident---tri-forked jacket with organic formed disc stud. 
Shooting Star--jeweler's brass comet tail jacket with star-stamped disc stud.
Mermaid--lobed tail jacket with bubble disc stud.