Ever hear of the "horn of protection"? It is also known as a cornicello. It looks something like this:
This charm is used to ward off the evil eye and protect the wearer from envy. A recent New York Times article about a society lady who needed one to protect herself from envious comments. Of course, in the NY Times, the Horn of Protection happened to be diamond studded. This, in my book, might even be a cause for envy.