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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.
Top 5 most expensive diamonds: No. 1 – The Koh-I-Noor - Royal Coster Diamonds

Top 5 most expensive diamonds: No. 1 – The Koh-I-Noor

Our Darling

Many people mention Royal Coster Diamonds and the Koh-I-Noor in the same sentence. Why is that? Upon its arrival in England in 1849, the diamond weighed 186 carats. In 1852, the British Royal House decided they wanted the most expensive diamond in the world repolished. Prince Albert, Queen Victoria’s regent, approached Royal Coster Diamonds for this noble task. Even back then, our expertise and craftsmanship where already well-noticed. Because our task to polish this famous diamond was so extraordinary, we dedicated more than just this article about it. Read more about the history of the Koh-I-Noor.

the koh-i-noor in the british crown

Repolished

Royal Coster Diamonds recut the Koh-i-Noor to about 108.93 carats so the Royals could also wear it a bit more easily. Queen Victoria mostly wore the diamond in a brooch. Later it was set in the State Crown, worn by Queen Alexandra and Queen Mary.
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