How about a soapstone carving kit? You could also consider getting her/him a piece of high-quality soapstone to carve, or a book on soapstone carving techniques for inspiration. Alternatively, you could look into workshops or classes in your area where she/he could learn more about soapstone sculpting and techniques from experts.
Or you can get her/him a star map with the date when she/he 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.