It's this sort of mentatilty which infuriates me. I'm sure that they're a pretty stable couple, and no ammount of trinkets would make any sort of difference unless you're one of those insecure types that walk around with the price tag still stuck onto your dress.
He should be able to do whatever he wants with his money without some bint getting all angry because he wouldn't buy her shiny rock that she can use for bragging rights with her friends.
I would quite happily purchase a nice gift for a girl with money that I have saved up specifically to buy the gift with, and not because she expects it of me becasue I came across a little extra disposable income...