A long necklace draws attention away from the wearer's neck to her upper chest. You can use one to display a large pendant or show off a string of beads. If the necklaces is long enough, you can even loop it around your neck more than one time to create the illusion that you are wearing multiple strands.
A long necklace is very versatile and gives you a lot to work with. Show off your style with a long necklace.