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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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  • Van Moppes Diamonds - Royal Coster Diamonds

    Van Moppes Diamonds

    Van Moppes Diamonds (est. 1877) was a world-famous diamond-polishing factory in Amsterdam. Together with Coster Diamonds and Gassan Diamonds, they formed the Diamond Foundation Amsterdam to promote ‘the City of...

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  • A Royal Crest - Royal Coster Diamonds

    A Royal Crest

    Recently, Royal Coster Diamonds revealed its crest at its annual Midsummer Night Party. The crest contains various aspects that represent the famous diamond polishing factory. There are two lions, a...

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  • Starting the Diamond Museum - Royal Coster Diamonds

    Starting the Diamond Museum

    Royal Coster Diamonds is more than just a diamond polishing factory. In 2007 we opened our own Diamond Museum to share our passion for diamonds with the public. The museum...

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