There are three main types of fastenings when it comes to stud earrings, with the most traditional being the butterfly back. However, andralok earrings and screw back fastenings have their advantages too.
| Andralok | Butterfly Back | Screw Back |
Andralok
The andralok style is a modern earring fastening, with andralok studs becoming increasingly popular. They remove the need to worry about fiddly butterfly backs, with the post having a hinge which just has to be flicked downwards once the earring is in the ear to secure it in place. No need to worry about losing butterfly backs with this fastening.
andralok 9ct yellow gold enamelled star stud earrings 
andralok 9ct yellow gold triple heart stud earrings 
sterling silver 3mm andralok ball stud earrings
Butterfly Back
A butterfly back is the traditional earring fastening. The butterfly shaped metal disk features two small loops with a hole in the middle which the earring post slots into. This fastening is generally used in new piercings, as the back can be positioned at various points along the post to allow room for swelling.
sterling silver 5mm cube stud earrings 
sterling silver open star stud earrings 
9ct gold butterfly backs scrolls for stud earrings 5mm
Screw Back
Screw back fastenings are a little less fiddly to secure in place than butterfly backs are. The post is threaded at the end, and a nut is rotated along the length of the post securing the earring tightly against the lobe. This fastening type is great for those who are highly active as it is very secure.
9ct gold & coral red screw back stud earrings 
9ct gold & freshwater pearl screwback stud earrings 
9ct gold & 4mm pearl screw back stud earrings
Which fastening type will you go for?