Order before Feb. 10th and get it before Valentine's.

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Why not explore our new Luna Collection?

Luna Collection

Find Your Ring Size

Royal Coster
Diamonds Size		 Internal Diameter / Circumference (mm)​
14,01
14,33
14,65
14,97
15,21
15,61
15,92
16,24
16,56
16,88
17,20
17,52
17,83
18,15
18,47
18,79
19,11

How To Measure
The Hands-on Method​ Measure an Existing Ring
  • 1. Grab a tape measure, length of string or strip of paper.
  • 2. 2. Wrap one of these objects around your finger. Mark the place where the two end of the measuring object come together.
  • 3. When using string or paper grab a ruler. Lay it on a flat surface and measure to where the marked point is.
  • 4. Use the chart presented above to acquire the correct ring size.

Still not sure? If you are still uncertain about the correct ring size our experts are happy to help. Please contact us here for any questions regarding the rig size.

Free Worldwide Shipping

We often talked about the importance of seeing a diamond with your own eyes before making a purchase. After all, two diamonds with the exact same specifications can look entirely different. We love to welcome you in our monumental buildings in Amsterdam. However, we also understand this is not always possible. That is why we arrange free worldwide shipping for orders over €1,500. Of course, this comes with the same Royal Coster service.

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Visit your favorite items at our Flagship location in Amsterdam.

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New collection

The Royal 201 Signature C Collection

With this special collection, Royal Coster Diamonds celebrates the essence of the Royal 201: emotional connection.    

Discover