You might feel better if you tell your wife, but even if she forgives you, she'd feel a lot better not knowing about it.
A girl would be a gold digger if that was the only reason she hooked up with you in the first place.
Otherwise the whole jewlery thing would just help you get laid tonight instead of next week. No biggie.
Just think about how the gold digger ones would be if it werent for the jewlery and you'll say phuk it, they deserve it. Even if you think they didnt deserve it despite the fact that they might have been bitches, you wouldnt feel too guilty, although you may have done wrong.
Besides, dont they enjoy sex too? Its like you buy them something to do something they enjoy?
Reminds me of Tupacs "Fair exchange" in which he said "your attitude aint realistic, yeah its true i'm getting pussy, but baby, you're getting dick!" LOL
Seriously though, and far from that way of thinking, I think you're feeling waaaay to guilty and overreacting.
Think of it this way, if it were only the jewlery that got you between your legs, shes not worth thinking about too much. She just got paid for something she enjoyed, but got ripped off. Bad? Yes. Horrible? No.
If it werent the jewlery, then well, jewlery had nothing to do with it, although you might be guilty, somehow, when you look at other angles of it that you never mentioned.
Not that I ever did it, playing with her emotions, making her expect a long term relationship, or marriage etc just to get between her legs is what I would feel guilty about and would never do anyway.
If you really bought her jewlery and thats what got you between her legs, then you just got yourself one expensive prostitute.
If you USED jewlery ( paid for or not ) to play her emotions, that are NOT related to material ( girly romance etc) , then yeah you should feel guilty. But now that its over, get over it and be good to your wife, women, and everyone else and live a happy life.