Ronald Koster

Royal Coster Diamonds

About 350.000 visitors a year come to see our master diamond polishers and goldsmiths create the most stunning jewelry. During our tours, which are available in more than 25 languages, you will see historical treasures such as the Koh-I-Noor as well as innovations such as our Royal 201: A diamond with no less than 201 facets, creating the most spectacular sparkling effect you have ever seen. In addition, you will witness our craftsmen showing you the process of cutting and polishing a diamond from a rough stone to a perfectly crafted diamond. A brilliant experience which you will not forget soon. After one of our tours, we will also show you our exclusive and extensive collection of loose and set diamonds and the most amazing, custom made jewelry available in the world.