There are some difference in the Russians’ and the Americans' attitude to money and the cost of presents and gifts. Imagine that you go with your partner to a shop where you are going to buy her something, for example a wedding ring. She chooses something but the price seems to be too high for you, so that you say to the girl that the thing is overpriced. You certainly do not mean that you will not buy it for you, but she can think so. She can even suppose that you are a greedy man or just cannot afford it.
The point is that Russian women often fall into extremes and seem to be too categorical. There are no shades for them, they think in black and white and it is often difficult for them to come to a compromise with a partner.
She can even start to cry and get into hysterics only because she thinks that she will not get a thing she wants. She will certainly be sure that you are greedy and want to economy on her. And that can be the end of the relationships.
Some Russian ladies have a bad taste. They often buy kitschy and the most expensive staff just to show off and they do not worry that they can look ridiculous. There are some cases when men had to buy a wedding ring for five and more times only because they changed their minds and found a more expensive thing.
They can start envying their friends if they have a thing which they themselves wanted to. For example, if a woman bought a wedding ring (a very expensive and gaudy, with a huge diamond of a bad quality) and then saw another ring at her friend's finger (beautifully made, with a high-quality stone), which she liked very much, she will probably make her husband buy her another ring, similar to her friend's one. And she will continue doing it until her husband gives up and they go to the jewelry store. Russian women sometimes do not realize that big, expensive and gaudy is worse then really nice and of high quality.
Try nor to buy wedding rings in Russia – they are more expensive there and normally of poor quality. As the Russians have no such tradition as engagement, you can avoid buying your fiance'e an engagement ring and save your money on it. Wedding rings in Russia are normally very simple, without any precious stones or decorations. It will be better to get a wedding ring for her when you come to America and let her choose the thing herself – it'll be a real pleasure for her.
Do not buy the cheapest ring you see in the shop – in this case your fiance'e might think that you are a greedy man. Russian women often thing that the western men are greedy because their main interest is money and they often speak about it. Do not support this idea and try to behave in a different way with your future wife.
Some 
Try nor to buy wedding rings in Russia – they are more expensive there and normally of poor quality. As the Russians have no such tradition as engagement, you can avoid buying your fiance'e an engagement ring and save your money on it. Wedding rings in Russia are normally very simple, without any precious stones or decorations. It will be better to get a wedding ring for her when you come to America and let her choose the thing herself – it'll be a real pleasure for her.