Here is a guide to decide what length chain would be best for you.
This varies based on the size of your neck and your height, so keep that in mind.
16 inches: Fits tightly against the base of the throat, like a choker.
18 inches (average length of our chains): Sits around the middle of the collar bone.
20 inches: Sits in the middle of the breast bone.
24 inches: Sits around the bust area.
30 inches: Sits just below the bust.