What about a beautiful set of prayer beads? You could find a set made from materials that your husband likes, such as sandalwood or stone, and they could be useful for meditation and mindfulness practices related to Buddhism. You could also consider gifting a book on Buddhism, perhaps written by one of his favorite authors or about a specific topic within the religion that he's interested in. Additionally, a framed print or painting of a Buddhist image or quote could make a meaningful and decorative gift for your husband.
Or you can get him a star map with the date of your anniversary.
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.