Promise ring

So my birthday is coming up in September and our 1year anniversary in October. Babe has been asking what I want gift wise, now I dont like expensive things aside from my iPhone and food. That being said I saw this really pretty ring at Walmart, but is a ring something you just up and ask for? It doesn't have to have much meaning behind it I just want this ring, if he doesn't get it for me I'll likely just gift it to myself. I only titled it promise ring because when I found it online it was under that category...