December blue topaz - Birthstone ring

Method 1: Measure a well-fitting ring

1. Get a ruler and a well-fitting ring for the desired finger.
2. Measure the inside size (diameter) of the ring in millimeters.
3. The measured size in millimeters is your ring size.

Example: The inside size (diameter) of the ring is 16 millimeters, then you have ring size 16.

Method 2: Measure the circumference of your finger

1. Grab a strip of paper or string, a ruler and a pen.
2. Wrap the strip of paper or string tightly around your finger.
3. Make a line with a pen where the paper or string touches each other.
4. Measure the length to the pen line in millimeters with a ruler.
5. Use the table below to see which ring size corresponds to the circumference of your finger.

Example: The measured circumference of your ring finger is 50 millimeters. Then you have ring size 16.

Are you stuck?

Download our printable ring size guide, click here .
Or use the 'Ring Sizer' app from the Apple App Store on your iPhone.