At the heart of it since 1840.

At the heart of it. Since 1840.

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Why not explore our new 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.
luxury shopping experience

Free Guided Diamond Factory Tour

Visit the oldest diamond polishing factory in the world and enjoy a free guided tour in your own language. Watch the craftsmen and women cut and polish rough stones into beautiful diamonds. During the tour your experienced guide will tell you about the origins of diamonds, the 4C's of diamond valuation, the origin of diamonds and much more.
In a private room you will see part of the largest collection of unset diamonds and you will also see the Royal 201 diamond, This is Royal Coster's own patented diamond and known to be the best diamond in the world.

See the Koh-I-Noor, in the British Crown Jewels and some more of spectacular diamond artifacts.
Enjoy the jewelry collection at Royal Coster Diamonds!

What do you get?

- FREE tour available in 35 languages

- See largest diamond collection in Europe

- See the Royal 201 Patented Collection

- Learn about diamond facts

- See the Koh-I-Noor, in the British Crown Jewels

- Tax free shopping

Experience royal coster

free diamond tour & workshops

Visit royal coster

Book an experience and learn about our heritage or visit us to see more diamonds & jewelry