Since it is a birthday gift for your girlfriend, it depends on what your girlfriend likes. It is really good to give her something new. It is best if your girlfriend has never seen it before. You can go to a creative gift website to customize one.
First of all, you can give her a birthday newspaper. It is very popular now. Think about it. If your girlfriend receives a newspaper when she was born on her birthday, how happy she will be.
Secondly, you can give her a name necklace. It is specially customized with your girlfriend's name or pinyin. It is very thoughtful. On her birthday, put it on her by hand. It must be a very romantic scene.
Finally, you can also give her a box of blessing chocolates. Write some words you want to say to her, or birthday wishes for her. Such a gift will definitely move her, and chocolate is very sweet. It will definitely not be wrong to give such a birthday gift between lovers.