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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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  • History of the Museumsquare - Royal Coster Diamonds

    History of the Museumsquare

    The Museum Square In the 17th Century In the 17th century there were windmills and farms on the spot that we now know as the Museum Square. The...

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  • Corona Proof Winter in Amsterdam - Royal Coster Diamonds

    Corona Proof Winter in Amsterdam

    Christmas activities Christmas time in Amsterdam is a little different this year. Because of COVID-19 a lot of events and activities have been canceled. Thankfully there are still a lot...

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  • The Three Amsterdam Crosses - Royal Coster Diamonds

    The Three Amsterdam Crosses

    About the Coat of Arms The Amsterdam crest was presumably implemented around 1280 by the city of Amsterdam. Over the years it has been a little modified. But overall it...

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  • Top 10 Museums in Amsterdam - Royal Coster Diamonds

    Top 10 Museums in Amsterdam

    1. Rijksmuseum Perhaps the most famous museums in the Netherlands. The Rijksmuseum in Amsterdam is one of the sixteen state museums in...

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  • How to Protect Yourself from Pickpockets in Amsterdam - Royal Coster Diamonds

    How to Protect Yourself from Pickpockets in Amsterdam

    Popular pickpocket places Some things speak for themselves, like never leaving your bag unattended. However,...

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  • Artis Zoo - Royal Coster Diamonds

    Artis Zoo

    Artis is the Royal Zoo of Amsterdam, it was opened in 1838. In 2015 it was chosen as the best zoo of the Benelux. At Artis you cannot only visit...

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  • De Pijp: From Industrial Residential Center to Hotspot - Royal Coster Diamonds

    De Pijp: From Industrial Residential Center to Hotspot

    Royal Coster Diamonds is located at the Museum Square in Amsterdam. Our factory is here since the early ’70s. Before then, we were located at the Waterlooplein in Amsterdam –...

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  • The corridor of the Rijksmuseum - Royal Coster Diamonds

    The corridor of the Rijksmuseum

    Within a stone’s throw of Royal Coster Diamonds, is the Rijksmuseum. In the past few years, enough has been said already about the Rijksmuseum. But one of the small and...

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  • Amsterdam Squares - Royal Coster Diamonds

    Amsterdam Squares

    The city squares symbolize the whole areas of the city with their activity and the character. Big and open Dam square with the Palace of the King and the best...

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  • Tourist attractions in Amsterdam - Royal Coster Diamonds

    Tourist attractions in Amsterdam

    Amsterdam is a very attractive city for tourists, as it is a perfect combination of romance, adventure and fun. There are many things to visit during your stay in Amsterdam,...

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  • Canal festival - Royal Coster Diamonds

    Canal festival

    This festival is held during the 12th until the 21st of August in the centre of Amsterdam, during these days the concerts are mostly given in the evening and late...

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  • Holland festival - Royal Coster Diamonds

    Holland festival

    Holland festival is an international performance arts festival which will be held in Amsterdam from June 4th until June 26th. This festival is very advanced in its representation...

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  • The Concertgebouw - Royal Coster Diamonds

    The Concertgebouw

    The Concertgebouw is the Royal Concert Hall of the Netherlands, where the most beautiful classical, jazz and world music pieces are performed. Not only the Dutch philharmonic Orchestra plays in...

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  • Winter in Amsterdam - Royal Coster Diamonds

    Winter in Amsterdam

    "It's the most wonderful time of the year..." Winter in Amsterdam always has something magical. And there is so much to do! Let's forget it is cold outside and discover...

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  • Autumn in Amsterdam - Royal Coster Diamonds

    Autumn in Amsterdam

    If you’re into culture, autumn is definitely one of the best seasons to visit Amsterdam. The city is beautiful in every season, but during the fall Amsterdam looks extra magical....

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  • The Best Chinese Restaurants in Amsterdam - Royal Coster Diamonds

    The Best Chinese Restaurants in Amsterdam

    More and more Chinese tourists discover the beauty of Amsterdam. The city has everything you want for your trip overseas. Enjoy the rich history, great shopping streets and the most...

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  • Typical Dutch foods - Royal Coster Diamonds

    Typical Dutch foods

    Sushi, pizza, tikka masala, roti, noodles… Whatever food you like, you can find a restaurant in Amsterdam that serves it. The Netherlands were never exactly famous for their exquisite cooking....

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  • Discover the Vondelpark - Royal Coster Diamonds

    Discover the Vondelpark

    Looking for a piece of nature within the busy city? The Vondelpark is the “Central Park” of Amsterdam. Built in 1865 and still a beloved piece of outdoor for many...

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  • The 8 Best Shopping Streets in Amsterdam - Royal Coster Diamonds

    The 8 Best Shopping Streets in Amsterdam

    Some’s favorite activity in the world, other’s idea of a necessary evil: shopping! Whether you like shopping or simply just need to, you always hope to find the best shops...

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  • Summer in Amsterdam - Royal Coster Diamonds

    Summer in Amsterdam

    Although Amsterdam is beautiful in every season, the summer is extra special. Whoever thinks of Amsterdam doesn’t automatically think about the great weather. That’s just unjustified. In July and August,...

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  • Amsterdam Tips: 5 Things to do at Leidseplein - Royal Coster Diamonds

    Amsterdam Tips: 5 Things to do at Leidseplein

    Just a stone’s throw – or one tram stop – away from Royal Coster is the Leidseplein. The Leidseplein is basically a large square in Amsterdam. Back in the days,...

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  • A Family Visit - Royal Coster Diamonds

    A Family Visit

    Every day we welcome (new) customers to the Royal Coster Family. All our customers know: coming to Coster feels like coming home to your Amsterdam family. We take pride in...

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  • Top 8 Things To Do In Amsterdam At Night - Royal Coster Diamonds

    Top 8 Things To Do In Amsterdam At Night

    Planning a trip to Amsterdam? Of course, you want to make the most of your stay. There are plenty of historic sites, museums and other attractions to visit during the...

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  • Diamond Factories in Amsterdam - Royal Coster Diamonds

    Diamond Factories in Amsterdam

    Amsterdam has a rich history, and the history of the diamond factories is no exception. As one of the worlds most renowned and historic diamond centers, Amsterdam has a fascinating...

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  • Free things to do in Amsterdam - Royal Coster Diamonds

    Free things to do in Amsterdam

    When coming to Amsterdam, you want to get the most of it the few days that you are here. And who says having a good time has to be expensive?...

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  • 5 Places to Cool Off in Amsterdam - Royal Coster Diamonds

    5 Places to Cool Off in Amsterdam

    The last few weeks have been nothing but hot and sunny. You don’t hear me complain though. I like the sun. And besides, we have air condition here in our...

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  • Where to Celebrate King’s Night & King’s Day in Amsterdam - Royal Coster Diamonds

    Where to Celebrate King’s Night & King’s Day in Amsterdam

    On the King’s birthday, April 27, Amsterdam fills up like a rain barrel in a flood with people in orange outfits. In the night of 26-27 April, the first parties...

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  • Spring in Amsterdam - Royal Coster Diamonds

    Spring in Amsterdam

    After the brisk snowy winter season we had, the spring’s finally breaking through! The canals thaw and a fairly nice spring breeze blows through the city. Musicians are performing again...

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  • Dutch flower park Keukenhof - Royal Coster Diamonds

    Dutch flower park Keukenhof

    Thinking about the Netherlands, you think about tulips and other bulb flowers. One of the main reasons people think about flowers immediately is because of Keukenhof. Keukenhof is a huge...

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  • Top 10 Romantic Activities for Valentine’s Day in Amsterdam - Royal Coster Diamonds

    Top 10 Romantic Activities for Valentine’s Day in Amsterdam

    Many lovers like to visit Amsterdam around Valentine’s Day. The historic city center with canals and characteristic houses create the perfect setting for a romantic getaway. However, you can make...

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