How about a book on Jewish history or culture? "Jewish Literacy" by Rabbi Joseph Telushkin is a highly recommended option. Another idea could be a Jewish cookbook such as "Modern Jewish Cooking" by Leah Koenig or a traditional Jewish ritual item such as a mezuzah or a menorah. If your friend is interested in learning Hebrew, a language course or dictionary could be an excellent gift as well.
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.