Five Star Gift Ideas

For your boyfriend's birthday gift, you could consider these meaningful and personal gift ideas based on his interest in horology:

1. A high-quality watch: Consider purchasing a high-quality watch; your boyfriend will love to receive a new addition to his collection. You can look for a particular brand or model that he has been eyeing, or something unusual that he might not have discovered yet.

2. Horological book: If your boyfriend likes reading, you can give him a book about horology, such as "Watchmaking" by George Daniels, "The Wristwatch Handbook" by Ryan Schmidt, or "Fifty Watches That Changed the World" by Alex Doak.

3. Watchmaking course: Surprise him with a watchmaking course that he can attend on his own or with you. This way, you can learn something new together and spend quality time.

4. Watch accessories: Purchase some accessories for your boyfriend's watch collection. This could include a watch winder, watch case, or a leather strap.

5. Custom watch: If you have a creative side, you can design a custom watch for your boyfriend. Work with a jeweler to make a watch with his preferred materials and styling, make it a truly novel keepsake that he will treasure.

Or you can get him a star map with the date when he was born.