TELL YOUR WIFE THAT you have thought it over very seriously and that you have concluded if you bought her a beautiful expensive ring it could make people focus on the ring instead of the natural beauty of herself which you feel is more worthy of appreciation. In fact, it would be a waste of money as she outshines any expensive bauble.
It may work. But nothing is guaranteed in life, except death (which if my suggestion fails, maybe short in coming for you)
At least, have a bucket handy just in case she needs to puke.
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