Size Guide for Rings
US and French Sizes:
| US Ring Size | French Ring Size (aka Cartier Sizes) |
|---|---|
| 4.5 | 48 |
| 5 | 49 |
| 5.5 | 50 |
| 6 | 51 and 52 |
| 6.5 | 53 |
| 7 | 54 |
| 7.5 | 55 |
| 8 | 56 and 57 |
| 8.5 | 58 |
| 9 | 59 |
If you don't know your US or French ring size, please measure your finger following the instructions below.
Step 1: Measure Your Finger
- 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.
- Measure the string in millimeters (recommended) or inches with a ruler.
- Use the size chart below (Step 2).
Tips:
- Measure your finger at the end of the day.
- Avoid measuring your finger when it is hot or cold.
- Remember that the two hands differ slightly in size.
- Ensure the chosen size allows the ring to pass easily along the entire length of the finger.
Step 2: Find Your Size in the Table
If you measure in mm (recommended):
| Inner Circumference (mm) | US Ring Size | French Ring Size |
|---|---|---|
| 47-48 | 4.5 | 48 |
| 48-49 | 5 | 49 |
| 49-50 | 5.5 | 50 |
| 50-52 | 6 | 51 and 52 |
| 52-53 | 6.5 | 53 |
| 53-54 | 7 | 54 |
| 54-55 | 7.5 | 55 |
| 55-57 | 8 | 56 and 57 |
| 57-58 | 8.5 | 58 |
| 58-60 | 9 | 59 |
If you measure in inches:
| Inner Circumference (inches) | US Ring Size | French Ring Size |
|---|---|---|
| 1.89-1.95 | 4.5 | 48 |
| 1.95-2.00 | 5 | 49 |
| 2.00-2.05 | 5.5 | 50 |
| 2.06-2.15 | 6 | 51 and 52 |
| 2.15-2.20 | 6.5 | 53 |
| 2.20-2.25 | 7 | 54 |
| 2.25-2.30 | 7.5 | 55 |
| 2.30-2.35 | 8 | 56 and 57 |
| 2.35-2.40 | 8.5 | 58 |
| 2.40-2.45 | 9 | 59 |