This item was given to me almost 30 years ago. I loved the design and it was easy to use, and I still like it, but I've developed an allergy and have decided to let it go. I hope someone will be able to use it. Chain length: 39cm The charm has an inner diameter of 5mm in the ring part, so I think it would be easy to use with other accessories such as earrings. As a bonus, I will include a shell-shaped charm, also from agata. (This will not fit on the chain being sold.)