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Royal Creators of Beauty for Centuries

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Creators of Royal Diamond Jewelry since 1840

More facets, more sparkle, more fire!

Royal 201 Collection

Royal Coster Diamonds is famous for the highest level of craftsmanship for centuries. From this drive for perfection, the Royal 201 was born. Experts review the Royal 201 as the most beautiful diamond cut ever. Discover our selection of timeline classics with the sparkle that never ends.

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Diamond Jewelry

Diamond Engagement Rings
All Diamond Rings
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Diamond Necklaces
Diamond Earrings
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Book a Diamond Factory Tour

Our guided diamond factory tour is completely free of charge. We give free guided tours in more than 35 languages. Our guides tell you about our rich heritage. They explain how to evaluate a diamond and show you some amazing stones. So get your ticket today and discover the magical world of diamonds!

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Diamond Stories

Diamond Products

Diamond Anniversary: the Best Gifts

Your wedding anniversary is a momentous occasion. Whether it’s your first or your fiftieth. When your wife loves diamonds – and she probably does - it is easier to find the perfect anniversary gift. But which diamonds are the best anniversary gifts? Is it okay to give a diamond other than on the Diamond Anniversary? Let’s find out.

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Knowledge

Mm to carat

When you browse the internet to learn more about diamonds, you are bound to stumble upon the 4 C’s. The four C’s stand for: carat, color, clarity and cut. These factors determine a diamond’s value. But they don't show how to convert from mm to carat.

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