^^ This is a good side point. Don't ask a question about the cost or price just for the sake of asking. That is not cool.
If the question is serious, has merit, and isn't the first question asked, it could be taken seriously and be reasonable to answer, if you choose, of course.
At the end of the day, it's really all personal and individual.
So, how much ya'all pay for your wife's wedding ring?