I have heard of something where it's supposed to be tradition for three rings for a wedding - an engagement ring, a ring for the wedding, and another ring at the one anniversary. Then with either the wedding ring or the ring a year later one has a diamond and one is just a band. But I can't find this anywhere online.
Has anyone heard of this at all and can you explain the etiquette/how it works?

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Jewelry Forum

You do not get a three piece set. However, you can shop for them individually. You can check out numerous online jewelry sites where you can choose from a wide range at reasonable rates.