My wife noticed this morning that some jewelry she had bought was a knock-off of a local craft artist's work. Which inspired me to do some research on intellectual property for jewelers.
Turns out that designs can be copyrighted or (if three-dimensional) patented. Copyright protection is easy and cheap, but patents provide more protection. This bird's short take on this is to copyright almost everything; patent only designs that you expect to make a lot of money from.