
Learn what makes diamonds sparkle at the world's oldest polishing factory
Located near the Rijksmuseum, Royal Coster Diamonds is the world’s oldest still-operating diamond polishing factory, with over 185 years of experience. During this 60-minute private tour, learn about the history of Royal Coster Diamonds, diamond craftsmanship, and the process behind creating and evaluating diamonds. Discover the 4 Cs of diamond valuation: Cut, Color, Clarity, and Carat, and understand how they affect a diamond’s quality and value. Hear the stories behind famous diamonds, see replicas of the Koh-i-Noor and the Cullinan diamond, and learn about the Royal 201. The experience includes a guided tour, live diamond polishing demonstrations, personal attention, and a Royal Coster Diamonds gift.