An earwire is a bow of wire, looped to fasten an earring to a pierced ear.
It is generally made of precious metal or hypoallergenic surgical steel.
Earwires and similar forms can be made with simple wire wrap techniques.
There are a variety of both commercial and homemade jigs to improve the uniformity and speed of creation.
A simple homemade jig can be made with a block of wood and several nails, smooth metal pins or bolts.