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.
Royal Coster reopens it's doors - Royal Coster Diamonds

Royal Coster reopens it's doors

1.5-meter distance remains crucial

In line with the RIVM guidelines, we only allow groups of a maximum of 2 people in. It will be possible there are several of these small parties inside the buildings. But we always make sure everyone maintains 1,5-meter distance. This applies to other visitors and our staff members. Safety is our highest priority. Therefore, we applied lines on the floors to make keeping distance easier.

Diamond tours

It is still possible to book a diamond tour, such as a Royal Experience or a Free Guided Tour. Note that several aspects of these tours are changed. There are fewer people at the reception. Therefore, it may take a bit longer before you are welcomed inside. Our guides do not give handshakes anymore and keep a professional distance, but they still give you the warm welcome you are used from us. One of the highlights of the diamond tours is seeing real diamond polishers at work. Because of the distancing rules, there are currently fewer diamond polishers in. You can still see them at work but from a bit bigger distance. Since it is not possible to take a close-up look, we made videos that show the craft up-close. The goldsmiths work from behind glass walls; you can still go near them.

Making purchases

Looking at products and the purchase of diamonds and diamond jewelry is done in private showrooms. Our consultants maintain distance and won’t hand you items directly. They rather slide them across the counter.

Other regulations

Everything we do is in the context of preventing the coronavirus from spreading. Colleagues who are not feeling well don’t come to work. To keep everything running smoothly, we encourage visitors to book tours and appointments online. This way, we know how many people we can expect and let in. It is also still possible to book an online diamond consult. Our diamond consultants can talk to you via the website chat, Facebook messenger, WhatsApp or video calls.
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