
Keeping up with fashions. A close examination of shell beads from Blombos Cave (left) suggests that ancient humans there started off with one style of jewelry (bottom) and then shifted to another (middle) over the course of 3000 years.
Personal ornaments, often in the form of beads worn as necklaces or bracelets, are considered by archaeologists as a key sign of sophisticated symbolic behavior, communicating either membership in a group or individual identity. Such ornaments are ubiquitous in so-called Upper Paleolithic sites in Europe beginning about 40,000 years ago, where they were made from many different materials - animal and human teeth, bone and ivory, stone, and mollusk shells - and often varied widely among regions and sites.
Even more ancient personal ornaments go back to at least 100,000 years ago in Africa and the Near East. But this earlier jewelry seems less variable and was nearly always made from mollusk shells. So some archaeologists have questioned whether these earlier ornaments played the same symbolic roles as the later ones, or even whether they were made by humans at all.