Step into history and witness craftsmanship like never before. Visit the world's oldest operating diamond polishing factory in Amsterdam. Join our free guided tour to learn everything about the 4C's of diamonds and discover the art of diamond polishing – from a rough stone to a sparkling masterpiece. Watch our polishers and goldsmiths at work, admire the patented Royal 201 diamond, and see a replica of the Koh-I-Noor. This is one of the largest cut diamonds in the world, repolished at Royal Coster Diamonds. With one of the largest collections of unset diamonds worldwide, you will also have the opportunity to purchase diamonds with personalized advice from our experts.

Book your free tour now and become a diamond expert!