How do I tell my boyfriend I want a promise ring without sounding clingy?

so my boyfriend and I have been dating for over a year and we've started talking about moving in together but dont plan on moving in together for another year and I want a physical representation of commitment before we move in together. How can I tell him I want a promise ring? To clarify he hasn't thought of giving me a promise ring because I never wear rings and rarely will I wear bracelets. I do love to wear necklaces, so usually thats what he'll gift me.
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