Donut bails for Swarovski ring crystals give you an easy way to turn Swarovski crystal rings (#4439 square Swarovski rings or #4139 round Swarovski cosmic rings) into a pendant, rather like a setting for a crystal stone. Some styles have a loop so you can dangle a charm or small crystal inside the ring/donut, others have a loop at the bottom, and some are classic and smooth, with no extra loops.
