A local gallery once mentioned to me that on ocassion a customer will comment "oh, I'd like that necklace better without the pendant" or "I'd like that pendant but would like it on a plain cord". Well, it isn't always easy to have the right piece for a customer, but how about letting them choose? This way, a pendant can be worn evenings in a more elegant way and during the day it can be worn casually on a cord.
A couple of years ago I started making a few of my pendants with lobster clasps, so they can be clipped onto a nice beaded cord, a plain cord, a chain or even used as a zipper pull. Works like a charm (pun intended), lol