Check out NPR's article: Study Neanderthals Wore Jewelry and Makeup
From the article:
(Neanderthals) "only need to do that (wear jewelry) in a world where you have a complex network of relations, because if you only interact with your family or people you've known all your life, they know who you are, you don't need to use an identity card."
The role that jewelry has played throughout humanity is long and diverse. This article just adds more to what we already know, and gives an even more complex look at the lives of Neanderthals.