How exactly does buying wedding rings work?

My fiance and I are getting married in 2 years but are starting to plan now. I was wondering how exactly the wedding rings get purchased. Do we go out together and pick a set and buy them, or do we pick out each others and buy them separatly? Do they sell two-piece sets? I've seen a lot of three piece sets that... show more My fiance and I are getting married in 2 years but are starting to plan now. I was wondering how exactly the wedding rings get purchased. Do we go out together and pick a set and buy them, or do we pick out each others and buy them separatly? Do they sell two-piece sets? I've seen a lot of three piece sets that include the engagement ring, but I've already got that. Any advice? Thanks
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