Accessorize?

Alright I needs some help here. I’m have been trying to figure out how to attach jewels to my locks. I don’t necessarily want to add them now I think I will wait a few more years but when I do how in the world to I make them stay? I want to say I remember someone saying that you sew the jewelry into your lock to ensure that it won’t slip out. Even still how do you sew it in? do you do it like a button where you just keep going through that same holds, do you knot the string? What if I want to change them? Is that even an option? I want to know if there any other ways before I settle on that one. I have been looking at a few items from a site (New Bein') that I found and it has the exact jewelry I was looking for. I just want to make sure I know what I’m doing before I start.