To me, it's a lot cheaper to buy a ring with moissanite. This gem is almost impossible to distinguish from a diamond, it shines much brighter and is cheaper than a diamond. Of course, you will not have a gem that can be sold as an investment, but you save a lot of money in the first place (and weddings are expensive in their own). Together with moissanite you also get all the proper certificates, so it is safe to buy them and there is a huge selection of rings with this gem.