Royal Coster Diamonds tours
I Amsterdam City Card for 24, 48, 72, 96 or 120 hours
Explore Amsterdam with the I amsterdam City Card! Get free entry to museums, take a canal cruise, enjoy unlimited public transport and save money.
The diamond engagement ring workshop
Enjoy an intimate Engagement Ring Workshop at the Royal Coster to see how diamonds are polished. Browse the largest diamond collection in Europe.
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The inside story
The Royal Coster Diamonds in Amsterdam is the oldest, still operating, diamond polishing factory in the world. It was founded in 1840 and has since worked on a few historical masterpieces like the Koh i Noor, which is mounted in the Crown of Queen Mary and the Dresden Green Diamond, held in the New Green Vault at Dresden Castle. Among some of the famous clients of the factory were Queen Victoria, Empress Sisi and King Rama V of Siam who traveled all the way to Amsterdam to witness with their own eyes how the most sparkling diamond jewelry was crafted.