An engagement ring with a stone large enough that sends a clear message to any creeper to fuck off (and provides a visual statement explaining to him that he doesn't have enough money to play).
DJ: Wow, that's a hot bitch right there son.
DJ's Friend: OMG, check that fuck off ring, that's like 3.5 carats G. That's worth at least one organ on the black market...
DJ: God damn it, why must I work at burger king! But I'm certain my dick must be bigger than his, right? :/