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Find Your Ring Size

Royal Coster
Diamonds Size
MM / INCH (Circumference)
48 / 1.89 48 4½ 8
49 / 1.93 49 9
50 / 1.97 50 K 10
51 / 2.01 51 L 11
52 / 2.05 52 6 12
53 / 2.09 53 13
54 / 2.13 54 14
55 / 2.17 55 O 15
56 / 2.20 56 P 16
57 / 2.24 57 8 17
58 / 2.28 58 18
59 / 2.31 59 R 19
60 / 2.36 60 9 S 20

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Royal Experience


  • Experience over 180 years of royal adoration and exceptional craftsmanship.
  • Like a Royal: a private ±1-hour diamond tour that unveils Amsterdam's rich diamond heritage.
  • Explore private rooms in historic villas, showcasing breathtaking diamond collections.
  • Receive expert guidance and personalised advice to purchase and analyse diamonds, becoming a true connoisseur.
  • A sparkling gift bag

Experience Royal Coster


Since our establishment in 1840, royalties from all over the world came to Amsterdam to see and admire our craftsmanship. We’ve welcomed visitors like Empress Sisi, the Viceroy of China, King Rama V to Prince Napoleon. And now it’s your turn to visit.

With The Royal Experience you will be treated with a private tour and dive even deeper into the world of diamonds. An unforgettable experience that takes about one hour but lasts a lifetime.

Our tour guide will tell you everything about our rich legacy that is filled with royal stories. Learn how Amsterdam became the City of Diamonds and go ‘backstage’ and visit a private room in one of our four monumental 19th century villas’. Here, we'll showcase the timeless beauties we have created, and you'll get acquainted with a part of our extensive diamond collection. Of course, you will also be given the opportunity to purchase diamonds with personal advice from our experts.

During the private tour you will learn how to analyze a diamond and why some diamonds sparkle more than others. Ready to impress your friends with your knowledge? Book your private tour now and become a real expert on diamonds.

free diamond tour & workshops


Book an experience and learn about our heritage or visit us to see more diamonds & jewelry