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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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new collection

Garden Collection

Embrace new beginnings. Even after cold winterdays something beautiful awaits. 

Royal Coster Diamonds

Royal Coster Diamonds is the oldest diamond cutting company in the world. The Amsterdam diamond house is known for its craftsmanship, passion, a large stock of high-quality diamonds and a personal approach.

Located on the Museumplein in Amsterdam, we are at your service for diamond jewelry, high-end watches, tours and workshops.

Visit our new boutique

Gift Card

Looking for a meaningful and personal gift for someone? Surprise that special person with our gift card to find their dream piece of jewelry.

Luxury Watches

at discounted prices

Up 20% discount

tours and workshops

Mystical world of diamond craftmanship

diamond crafting ideas

Design your own ring

Send a sketch of your own design and let our goldsmiths fulfill your wish