A single bail allows free swinging and rotation around the chain axis. Bezel-set and multi-bail configurations hold the pendant in a more fixed orientation against the chest.
Made With Purpose
If a pendant and chain are being purchased separately, the bail's internal opening dimension is the compatibility check that determines what will physically work. The chain must clear the opening while fitting snugly enough so that the pendant does not slide freely along the chain.
Industry Insight
A pendant hangs alone as the focal point on a necklace, while a charm is designed to be collected, combined, and added to over time.