Earrings: Post or Stud

A favorite style of earring is the stud earring, often set with a locking post for continuous wear. 

borsheims.com/blog/types-of-earrings tells us: 

Stud Earrings

Stud earrings tend to be on the small side and sit snuggly on top of the ear lobe without dropping downward, looping backward, or climbing upward. Typically featuring a simple design, studs are comfortable to wear and look great with any outfit. Diamond studs are a jewelry box staple and one of the most popular styles of earrings. 

Post Backs

Post back earrings are the most common type of earring backing and are used on everything from studs to dangling earrings. There are several different options when it comes to post back earrings, including push backs, screw backs, and lock backs.