How about creating a customized seashell collection display? You could find a beautiful frame and use a strong glue to attach the shells to the backing. Then, arrange the shells in a way that's aesthetically pleasing to your girlfriend. Bonus points if you can find a unique or rare seashell to include in the collection. Alternatively, you could plan a romantic day trip to the beach or book a weekend getaway to a beach destination where she could add to her collection.
Or you can get her a star map with the date when she was born.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.