US - UK Ring Size Conversion Chart

This chart allows you to convert a US or EU ring size to a UK ring size. This chart also shows you what your Cartier ring size would be. 

Ring sizes can differ even per European country — Germany, France and Switzerland all have slightly different ring size charts, so be sure to consult a ring size conversion chart if you are thinking about buying a ring outside of the UK.

Cartier ring sizes

Cartier uses their own ring sizing guide, we have put together this chart to help you to convert your UK ring size into your Cartier ring size. Simply find your UK ring size on the chart and then look across to the corresponding Cartier size. 

Pre-owned Cartier Jewellery sizes

It is also important to note that our pre-owned Cartier jewellery is sourced from around the world to give you the best rates, so please check if the size is correct for you. We will often publish the ring size in different countries on our product pages. 

Knowing Your Ring Size 

Measure your finger at the end of the day and not when it is hot or cold. The ring size for each finger will quite likely be different so make sure you measure each finger individually. 

Ensure that the chosen size allows enough room for the ring to pass easily along the entire length of the finger.

Please note that the style of the ring will also affect the choice of size: a large ring is made to be worn more loosely than a smaller model.

Read our Ring Sizing page to find out how to find your or your partner's ring size.