Online searches for the term "engagement ring" increase dramatically the week before Thanksgiving. (The theory: people like to pop the question over the holidays.) And with news of Kate Middleton and Prince William's pending nuptuals, we can only imagine that the searches have jumped even more dramatically this season. On the hunt and need some direction? We've rounded up the shiniest, prettiest, and the most unique engagement rings out there so that when it finally happens, it'll be just right.