How about a personalized mineral collection box? You could purchase a wooden storage box and have his name engraved on it, and then fill it with a variety of minerals and stones he doesn't already have. You could also include a book on the geology of the area where the minerals were found or a map of local rockhounding sites. This gift will not only feed his love of mineral collecting but also be a visually appealing piece to display in his home.
Or you can get him a star map with the date when 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.