Pani Antywieszakowa from Style, Trashion & DIY blog made a tutorial for these stylish, easy and simple chain rings. The blog is in Polish, but the pictures show everything. You don´t need much chain for these rings, so you can recycle your broken jewelry for this project. Jump rings don´t cost much and if crafting is your thing, buying small pliers is always a good idea.
Pictures via Style, Trashion & DIY.