Crystal Ball
I'm not sure how old this is -- it belonged to my grandmother, who was a strega (Sicilian witch), and she died fifteen years ago. I don't really know anything about its material, other than that I'm certain it's too old to be of the crappy composite that one sees for sale on ebay these days. It's 5" in diameter, and comes with a small wooden stand, as shown.
$175.00 + $15.00 shipping & Insurance.