They are the master cutters who were summoned by Prince Albert and Queen Victoria of England to re-polish the Koh-I-Noor. After such an impressive clientèle, who needs an introduction. Coster Diamonds is one of the largest Diamond dealers in Amsterdam. The reputed store in the city offers guided diamond-cutting and polishing tours (in 25 languages) for free. After the tour one can browse through loose and set diamonds at the showroom and pick up some really fantastic pieces at factory prices. For a dazzling experience, Coster Diamonds is the place to be.