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

Free shipping and insured in Europe.

Lifetime free cleaning and polishing.

Your cart

Your cart is empty

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.
Empress Collection - Royal Coster Diamonds

Empress Collection

In 1884, we welcomed a very special guest: Empress Sisi. The monarch of Austria-Hungary was often found in Amsterdam. One of the things we consider her trademark were the diamond stars she wore in her hair. However, it was no secret the Empress loved diamonds. When it comes to diamonds, there is no better place to find them than in ‘The City of Diamonds” As an homage to this unique visitor, we created the Empress Collection. A tribute to a very special woman.

No matches

Return home
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