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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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  • The 1st C: The Carat - Royal Coster Diamonds

    The 1st C: The Carat

    For many people, buying a diamond is not an everyday business. It seems quite difficult already. But if you dive deeper in the world of diamonds, it appears even harder...

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  • Amsterdam: City of Diamonds - Royal Coster Diamonds

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  • Brief History of Diamonds - Royal Coster Diamonds

    Brief History of Diamonds

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  • The 2nd C: The Color - Royal Coster Diamonds

    The 2nd C: The Color

    The color of a diamond –or rather the lack of it – tells us something about the value and quality of the diamond. A diamond that consists of carbon only...

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  • The 3rd C: Diamond Clarity - Royal Coster Diamonds

    The 3rd C: Diamond Clarity

    The 3rd of the four c’s we discuss in this series is the clarity of a diamond. A natural diamond is rarely without imperfections. It is a hallmark of Mother...

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  • The 4th C: Diamond Cut - Royal Coster Diamonds

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    The fourth of the four C’s in this sequence is the Cut, or shape of a diamond. The shape is important to determine the quality of the polished diamond. The...

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      Carat, color, clarity, and cut. These are the so-called 4 C's. You take them into account you're about to make one of the most important...

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  • What are Synthetic or Lab Grown Diamonds? - Royal Coster Diamonds

    What are Synthetic or Lab Grown Diamonds?

    Artificial or synthetic diamonds are (almost) impossible to distinguish from natural diamonds. They are just as beautiful, hard and brilliant as natural diamonds. The only thing they do not have...

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