Pisces girls like crystal products very much. You can give your girlfriend a gift made of crystal, such as a crystal piano music box with a photo of your girlfriend printed on it. It is a thoughtful and romantic gift. Most girls will like it. It is permanently preserved and has special commemorative significance.
There are also constellation ornaments made of crystal. Make it into Pisces, or give her twelve different constellations at once. I believe your girlfriend will be very happy.
Some constellation books will also make your girlfriend like them, because she is keen on studying constellations. Strange constellation books will definitely attract her attention.
Of course, Pisces girls also like romance and surprises. You must consider it carefully when choosing a gift. Give her a gift that she has never seen before and has a romantic feeling. And don't let her know what the gift is before giving it to her. Give her an absolute surprise.