Step into history and witness craftsmanship like never before. Visit the world’s oldest working diamond polishing factory in Amsterdam. Book our tour and learn all about the 4 Cs of diamonds and discover the art of diamond polishing – from a rough stone to a sparkling masterpiece. Watch our diamond 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, recut by Royal Coster Diamonds. Then, explore breathtaking diamond collections in a private room in our historic villas.

With one of the largest collections of loose diamonds in the world, you’ll also have the chance to purchase diamonds with personalized advice from our experts. Book your tour now and become a diamond expert!