A great feature of classic jewelry, such as a gold chain, diamond studs, or string of pearls, is that they never go out of style. They might cost a lot, but you can wear them every day for the rest of your life and pass them on to your daughters.
Costume jewelry, on the other hand, has a shelf life. The pendant with a peace sign, a happy face pin, and anything you made by melting strips of plastic together, may be considered disposable.
Yes, they are small, and don’t really create a huge clutter problem. But if they’re never going to be used again, maybe a little girl would like them for the dress-up box. Maybe a drama club could use them for costumes. Maybe they wouldn’t take up too much room in the landfill.
Let go of old things to make space for new things. Maybe some diamonds are waiting to enter your life.