From the show Supernatural, this is a pendant/charm of the warding tattoo both sam and dean have on their chests. It has a bumpy detailed surface which will give it a nice old/handmade look when printed in certain metals... I hope :)
FYI: This will be updated after testing (bookmark me)
DISCLAIMER: This is still for testing, so I can't confirm whether it works or not. It is designed to be printed in antique bronze glossy or matte.