There are two types of birthday gifts for girlfriends. One is thoughtful. For example, in this season, it is best to give warm things. Snow boots are warm and fashionable, which is a very good gift. Or observe what your girlfriend lacks recently, or what she has always wanted, and buy one in advance. She will definitely be touched by your thoughtfulness.
The other is a unique gift. It is a gift made by you or customized for her. You can give her a sterling silver necklace, and you can choose the pattern yourself, and you can write her name or your name. It is also very good to customize a couple's ring. It takes time to customize these birthday gifts, just in time to prepare them for her!