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As a person who knows nothing about marriage, I don't understand the whole engagement ring + wedding ring thing, is the grossly expensive engagement ring like just for show while you're engaged and then you like put in in a box or something? The one my mom wore I guess like fit together as a 2-piece set but I get the impression this is not the norm.

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What I've typically seen is that the engagement ring has the big rock on it, and the wedding band is actually pretty simple. After the wedding, the bride will wear them both, on the left hand, wear the wedding band on the left and the engagement ring on the right, weld them both together and wear them on the left, etc, etc, ...