I think it doesn't matter what it costs in all honesty. Hubby knew I'd have a Diamonique one from QVC, I really wasn't fussy. His proposal was a big surprise (not in grandeur, just in timing) and I never saw it coming, we hadn't ever discussed rings so I was pleased as punch when I saw the ring he'd had designed, spot on me. Classic but different.
I know how much it cost but think it's irrelevant. It made me sad that my friends were a little obsessed knowing how much it had cost as I didn't care, it was more important to them. Personally I just liked knowing that he wanted to marry ME. I love my rings and was gutted when I could no longer wear them when I was pregnant. I've just got my wedding band back on and so relieved. I can't wait to get my engagement ring back on now either, I felt lost without them.