What should i get my boyfriend for our one month?

My boyfriend,Nick,and i will have been dating for one month this coming saturday on the 24th. When he went to Myrtle beach about 2 weeks ago, he got my a crystal treble clef necklace since i sing,play piano,violin,cello,guitar, and flute. Anyways our song is you and me by life house but we also have two other songs that mean something to us which is your side of the bed by trey songz and time by cute is what we aim for. Now i was thinking a watch with the word Time in cursive of the back may be appropriate but he also always wears a necklace chain or his foot ball necklace with his number and initials on it. So i was thinking a watch or necklace, not to expensive but that will symbolize our relationship and have a deep meaning to it, anyone have any ideas or suggestions?