It's a good idea to be able to thread on a small pendant
"Unusual style of chain, I've never seen one like it till recently, I found a silver one, and brought it, now stumbled across this, similar one. This can have added a small hole tiny pendant or bead to add intrest, to keep the chain unthreading, it's an idea to feed the rigid pin back through the small loop to lock in place, so it doesn't undo, my silver one is better, as it has an extra loop to do so, to stop it undoing, I can't trust myself to wear this otherwise, as I feel it could easily slip open, with natural body oils present, It's quite a good quality, but not very shiny unfortunately."