How about a nail art kit? You could include different polishes, nail stickers, gems, and tools like brushes and dotting tools. Alternatively, you could purchase a subscription to a nail art magazine or a class on YouTube or a nail salon. And if you want something more personalized, you could create a custom nail polish or nail care kit with their favorite colors and brands.
Or you can get her/him a star map with an important date you share.
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.