How about a personalized cosmetic chemistry kit for the newlyweds? You could include ingredients, tools, and instructions for making their own customized beauty products. You could also consider a book on the subject, such as "Cosmetic Chemistry: A Practical Guide for Formulators" by Zoe Diana Draelos or "Introduction to Cosmetic Formulation and Technology" by Gabriella Baki and Kenneth S. Alexander. Another option could be to gift them a subscription to a cosmetic chemistry magazine or website, such as Cosmetics & Toiletries or Chemists Corner.
Or you can get her/him a star map with the date of the wedding.
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.