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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.

Press

Get in Touch

Our press team loves working with journalists around the world to share compelling, unique stories. If you’re a member of the media and would like to talk, please get in touch with the appropriate team or send an email to press@royalcoster.com.

Only media inquiries will receive a response.

Royal Coster Diamonds

Paulus Potterstraat 2

1071 CZ Amsterdam, The Netherlands

Open from Monday - Sunday: 09:00 - 17:00

Phone Number: (+31) 20 305 5555

ROYAL COSTER DIAMONDS

AT THE HEART OF IT. SINCE 1840.

The world’s oldest and most trusted diamond factory has a rich and compelling history. Royal Coster Diamonds is around for a long time, dating back all the way to at least 1840.

Our Craft

The art of cutting diamonds

At Royal Coster we take pride in our craft. We handpolish all jewels in-house before they receive our trademark Crown. Read how more about our trade.

SIGNATURE CUT

About the Royal 201

Learn about our unqiue and signature cut, the Royal 201 Diamond

EXHIBITION

AN ODE TO PERFECTION

Experience the perfect combination of modern technology, creativity and craftsmanship during this exhibition.

SIGNATURE

SIGNATURE C COLLECTION 

Use these sections to promote a particular feature with editorial photography.

Recent News

‘An Ode to Perfection’ exposition - Royal Coster Diamonds

‘An Ode to Perfection’ exposition

'An ode to Perfection' expositieDe expositie ‘An Ode to Perfection’ neemt je mee in de wereld van diamant en slijpvorm. Centraal staat de Royal Coster 201: ‘the perfect balance’. Een...

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Precautions Regarding the Coronavirus - Royal Coster Diamonds

Precautions Regarding the Coronavirus

COVID-19 has the world in its grip. We are now trying to find our way from an "intelligent lockdown" into the "New Normal". This also applies to Royal Coster Diamonds....

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