Well, I knew my missus for 5 years before we got married, and we were engaged for about a year I guess...
The ring I got her was *gulp* £3,500 - give or take a few - it was a solitare diamond, flawless (D rating for colour), on a platinum ring...
The wedding rings I can't really remember how much they were but I think in total they came to about £600 for both...
It was more than I had intended to spend on her, but she fell in love with the ring... that was her excuse anyway