1. Earrings can be divided into the following groups according to their shape
Stud earrings (pierced earrings)
There are many different types of stud earrings, but this category is mostly used for the simpler non-dangle earrings that close with a type of pull-lock.
The smaller dangling earrings, which are shaped like a teardrop, are called teardrop earrings. The clasp can be of any type.
Chain drop earrings
This subheading includes all earrings with chains, usually with long dangles. This subheading includes not only the pull-through type, but also any chain earrings with a clasp.
All hoop earrings fall into this category, whether they are endless clasp, bar clasp or even snap-in type.
These are usually larger, ornate dangling earrings, usually with a plug - pull-lock fastening, which is necessary to secure the already large and heavy earrings to the earlobe more securely and to prevent them from swinging too much when worn. Of course, there are other types of clasp, but they are more for the smaller sizes.
All dangle earrings collector category. They can be fitted with any kind of clasp or hook and are independent of their size.
An earring is usually worn as an accessory to a general earring, but can also be worn on its own. It does not require a hole in the ear, as this type is applied to the outer cartilaginous arch of the ear and stays in place securely enough by hugging it. They are usually made of a thinner material, so if they are a little loose after fitting, they can be squeezed shut.
Ear Jacket earrings
This is an interesting type of earring, worn with the thin, unadorned stem threaded through the earhole and turned upwards to fit the outer curve of the ear from the inside. It should be squeezed so that it doesn't flop, but also so that it doesn't pinch. They are always made in symmetrical pairs, as this is the only way to fit the curve of each side of the ear. It gives the impression of having several holes in the wearer's ears, each with a separate tiny earring.
2. Earrings can also be grouped according to their clasps
Usually made of a smooth, thin chain of some kind and worn dangling through the earhole on either side of the ear. The length is very variable.
This is almost the simplest earring clasp design, whose biggest advantage is that it never breaks. There is also a fully open version and one with a small loop at the bottom of the hook that secures the bottom of the hook-in catch. For those whose ear hole is a bit protruding, the latter version is recommended to avoid losing the earring. There are also tiny, pierced silicone spheres to secure the open version.
Round, oval or any other square shape, which opens at the bottom by means of a hinge and closes at the top by a snap-fit into a small hole in the side facing the earhole.
A very similar type to the butterfly lock earring, except that instead of a butterfly lock, it closes with a threaded fastening end. This type of clasp can be said to be quite secure, and there are also threaded ball ends, similar to piercings, which can be comfortable and safe to wear, even for little girls.
Commonly used for hoop earrings, this is a relatively simple type of clasp that gives the appearance of an infinite hoop.
A type of lock similar to the leverback, but this one locks forward. It's also called a baby clasp because it's easier for a mother to turn it on from the front for her baby girl, and she'll notice it sooner if it's accidentally turned off.
This is a slightly stronger patent spring with a hinged tongue at the bottom that locks to the earlobe by squeezing it between the two sides, so no earhole is needed to wear it. The strength of the grip keeps it in place on the ear.
Secure lock back
Similar to a butterfly lock, but instead of a spring-loaded butterfly lock, a locking plug, usually containing some kind of silicone insert, secures the end of the stem.
This type of earring hanger is almost the same as the regular hook and loop earring hanger, only the shape is different. It is also usually larger in size, as this is the type that gives the earrings their shape.
Latch back (French lock, plug-in clip)
In this lug lock, an ear is bent over the stem through the earhole from the rear, a spring-loaded ear on a lower hinge is bent over the stem and the spring holds the rear lug in the closed position above.
Russian lock (English lock)
This type of lock works by bending an ear, which moves on a lower hinge, onto the stem through the earhole from behind and snaps into a notch near the end of the stem. The rear lug has no spring and moves freely when open.
Patent lock (traditional lock)
Similar in appearance to a hook and loop, but usually slightly smaller and with a spring-loaded back lever that slides on a hinge from below to lock it securely in place.
Butterfly lock (push back, stud)
The most popular type. If you are looking for small and simple earrings, this might be the best choice. The end of the stem is secured by a small spring-loaded butterfly clasp (stekker). A little before the end of the stem is a tiny notch, into which the spring-backed end of the butterfly lock snaps.
The barrel clasp is usually used for hoop earrings and possibly other shaped earrings that also encircle the earlobe. The stem, which is usually slightly curved and moves on a small hinge with a pin on the front side of the earring, locks (snaps) into a small fork located on top of the back of the ear behind the back ear.
Secure lock back (Silicone plate clutch lock, pull lock)
The principle of this earring clasp is the same as any other pull-lock earring. A stem is threaded through the earhole behind the ear to form the locking plug, which in this case is either a metal clutch lock with a silicone plate or a simple silicone plate which is the locking element. The big advantage is that if someone's ear hole is slightly protruding, or their earlobe is thinner than average, a larger size plug does not stop nicely, but hangs forward on the ear, which is not an aesthetic sight. This larger sized silicone plate, on the other hand, will support the earring nicely in most cases and will stand up perfectly.
Protective shutter back (drawbar)
This type of lock is the most secure, but also the most expensive, which is why this type is mainly used for very valuable earrings. Closed on the plug, the spring lock is opened by buttons that can be squeezed from both sides, which hold the plug on the stem when closed.