How about this - you could get her/him a custom-made arrowhead necklace or keychain. Look for a local artisan or jeweler who could make them from actual arrowheads that he or she has found on their own hunts, or use a replica if you can't find any real ones. You could even add a small note or card saying how much you admire their passion for arrowhead hunting and that you hope they treasure and wear the gift with pride.
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.