Earring jackets are used as an adornment for you stud earrings. You may have a stud with large precious stone or diamonds. An earring jacket can be a metal ring or dangle or even stones in a circle, dangle, etc.
An earring jacket is made to give your studs, whether they are diamond or gemstone, an updated look. The earring jackets you pick can add a lot of glamour by adding large stones or a lot of metal or just a tiny adornment like a halo earring jacket.
Either way, earring jackets give the advantage of versatility.