What do you think about promise rings?

Not the rings but the meanings. I have been dating my girlfriend for about three months now. This is my second serious relationship, my last lasting a year and two months. I really do love this girl. I can honestly see my self with her in the future. I've asked her about it and she says she could too. But the thing is do I give her a ring or is this just puppy love?
What do you think about promise rings?
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