A buddy of mine met some whore and proposed to her after 3 months. Yeah, he's kind of a moron. He bought her ring at an antique store or flea market or garage sale, something along those lines, I can't remember. He paid $120 for some old ugly piece of shit with a tiny little diamond. Seriously, it was the ugliest ring I had ever seen. He tried to justify the purchase by saying it was "classic" because it was made in 1936 or some shit like that. They broke up a week later, and the ring didn't even fit to begin with
Like others said, buy what you can afford. As long as she loves you, she'll love the ring. Who cares how much or little it costs, just buy something you think she will like.