At the heart of it. Since 1840.

At the heart of it. Since 1840.

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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.
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.

7 dagen per week

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