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is there a difference between a wedding ring and wedding band? not really. wedding rings can be thought of as a bit more intricate with small diamonds or stylized band. and a wedding band is typically more plain.
should you buy a wedding ring or engagement ring first? usually, it's better to just buy the engagement ring first, especially if you're not sure if the proposal will be successful. or maybe you don't know what kind of ring she'll like, and there's a chance she won't love what you picked. some girls also like to pick their own wedding ring later.
if you have discussed marriage or even looked at ring styles together, then you can buy the rings at the same time if you see a matching set.
also called a "wedding set," this is a set of matching engagement and wedding rings for the bride. most jewelers will have some bridal sets to choose from.
to start, check out james allen's inspiration gallery to help you choose the right setting and diamond for your ring. 
there are some advantages of choosing a bridal set:
the rings will look good next to each other. you wouldn't have to worry about finding a matching wedding ring later.
they will fit comfortably together. sometimes, rings that don't match will pinch the skin or have an unsightly gap.
you only have to buy her wedding jewelry once. and oftentimes, it saves you a bit of money to buy a set of rings.