Material What Material Should I Use For A Necklace With A Polished Rock On It?

What material should I use for a necklace with a polished rock on it? - material

I have some cool rocks and I cut a hole. I want some material for a necklace, bracelet add. I think that flossing embroydery in a pattern or leather. These are the ideas I have. Can someone me an idea or a model material is a material