As we age, we like to not emphasize our necks, so some of our most loved necklaces are no longer worn. Adding an extender chain the necklaces can lengthen them enough so they do not draw as much attention the neck area as they used to. The length of a necklace extender chain is really personal preference. On some necklaces, I add 2" extenders, and on others, it is 3" long. Some people use bracelet chains as extenders to add even more length. Necklaces are then long enough to wear over heavy sweaters in the winter.