Free shipping and insured in Europe.

Lifetime free cleaning and polishing.

Free resizing service.

Your cart

Your cart is empty

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.
Bij Royal Coster Diamonds streven wij ernaar om u zo goed mogelijk van dienst te zijn. Indien u vragen heeft met betrekking tot diamanten sieraden of u zoekt contact met een diamantconsulent, dan kunt u ons bereiken via het onderstaande:

Telefoon: +31 020 305 5555
E-mail: support@costerdiamonds.com
WhatsApp: +31629705658

Maandag t/m vrijdag van 09:00 - 17:00 uur.

7 days a week

Get In Touch

Email, chat or call to consult us on your next purchase.

VISIT US

VIEW IN STORE

Visit your favorite items at our Flagship location in Amsterdam.