What is the point of Cameo Necklaces?

To carry a portrait of your beloved or your children or decoration with someone famous - like the president. This was before photography and the choices were painted miniature portraits on ivory or porcelain or cameo or silhouettes made with layered stone or porcelain and carved. a href="http://www.google.com/search?hl=en&q=portrait+cameo&rlz=1B3GGGL_enUS366US366&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&biw=731&bih=543" rel="nofollow"http://www.google.com/search?hl=en&q=por…/a