HiCustomer Thank you for asking your question on JustAnswer. By the way, it would help us to know:
-What is your age?
-Are you dating someone now?
-Do you want to be engaged or a promise ring?
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If you are giving her a promise ring to promise to marry her then it should go on the left hand ring finger and that is the same finger an engagement ring goes on if it were just a friendship ring then it would go on the right hand ring finger but when you buy the engagement you should replace the promise ring with the engagement ring and then she can wear the promise ring on the right hand ring finger or a chain around her neck.