I Need Advice On Engagement A Ring?

I am supposed to be getting married on July 15 and my fiance wanted to give me a ring to show that we are engaged since no one believes we are because of the absence of the ring. Anyhow, I told him that we could get a cubic zirconia ring because it really is just to show that we are engaged and that's all. He said that he did not have a lot of money for a ring and that is why I took the ring down to fake so he could afford it. He has asked me to help him pick the rings out and I have been sending him different links to really nice, but affordable cubic zirconia rings. He never told me what the limit was, so all the rings I have been sending him was $120 to $410. I know the one for $410 is getting a little expensive but he told me to send him anything that I like so he can get one he knows I will like. So tonght I did a little more probing because I did not want to send him links that are out of his range and he told me that his limit is $95 and if it was more he would have to save more. I did not know that he meant that cheap, I was thinking at leat $120 dollars. I do not mind having a cubic stone but I really don't like the idea that I am going to have an engagement band that is something other than white gold because more than likely it will not last long and I wanted that ring for a lifetime. I offered to pay for half and that way we can get something that is close enough to the real thing and not be something that will have to be replaced and he said no, he wanted to do it on his own. I am not demanding and I do not mind paying for the ring I have been looking at for $198 but he wants to do it himself and he already stated that he is $100 less than what is needed for the ring. Do I try to push it again and just pay for it myself or do I let him buy whatever and just hope that I don't have to have it replaced again in a few years?