How to measure  your ring size

Diameter is the measurement across the inner width of the ring
You'll need:
  • A ring that fits you
  • Ruler
Step 1:
  • Find a ring that fits.
Step 2:
  • Lay ring on top of ruler, and measure the widest area inside the ring from inner edge to inner edge. Round to the closest whole millimetre.
Tip:
  • If your ring is a different shape and is not circular, measure the shortest distance across.

Ring Size Guide

Discover your perfect fit with our concise jewellery size guide, ensuring every piece is just right for you.
Rings
MEASURING GUIDE
To determine your ring size, we strongly advise that you measure the size of your finger rather than the size of another ring.
  • Using a length of string or ribbon, wrap it around the base of your finger. To ensure the ring fits comfortably, we suggest measuring your knuckle as well.
  • With a pen, mark the point on the string where the end meets.
  • Use size chart at the bottom of this page. Refer the size you found in the 1st column (named “finger circumference in MM”) to then find the right size by Cartier collection.
  • Measure the string in millimeters (recommended) or inches with a ruler.
TIPS
  • Measure your finger at the end of the day.
  • Do not measure your finger when it is hot or cold.
  • Remember that the two hands differ slightly in size.
  • Make sure that the chosen size leaves enough room for the ring to pass easily along the entire length of the finger.