Buy her the CZ,---- BUT---- tell her it is temporary until the two of you pick out the ring of her dreams together from what the two of you can afford. At that point you can make a logical choice together. Maybe a ring won't be as important to her as a down payment on a small home. You should be honest and make big decisions together. Diamond rings are very expensive and should be a decision made together. You can get her a diamond wedding band with lots is of small diamonds for a lot less money than a solitaire diamond. They sparke just as much and won't break your budget. Whatever you do, do it together.