Boy meets girl. Boy courts girl. Boy gives girl a diamond ring, and they live happily ever after. Well, not always. Sometimes, the fairytale doesn't end so well, and someone is left with a valuable piece of jewelry filled with painful memories. Enter the diamond ring resale website I Do Now I Don't, which allows sellers to connect directly with buyers on a budget. In theory, all parties involved get a better deal than going the traditional retailer route — but how does it work?