Why some BFs are willing to buy jewelry for the GFs?

Why are some BFs willing to buy jewelry for their GFs, expensive or not? In general, does it mean the guy is very into the girl and the relationship? My bf of 1 mth just bought me a crystal bracelet in my favorite color from China during his trip, and I was pretty surprised because jewelry as a gift has a special meaning to me (meaning commitment) but I'd like to see other people's opinion as well. Would guys still ever buy jewelry for girls they aren't serious about?