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How to buy a promise ring
Decide what finger the ring is for.
Promise rings traditionally go on the ring finger of the left hand, and are replaced by the engagement ring if you and your partner get engaged. However, there is a much looser code when it comes to promise rings than there is with engagement or wedding rings.
Pick what finger seems right for you and your partner. If you don't want the promise ring to eventually be replaced by the engagement ring, consider buying the promise ring for a finger other than the ring finger.