Ring Size Guide

1. Measure with a Ring You Already Own

  • Take a ring that fits the finger you want to wear your Blue Morpho piece on.
  • Measure the inside diameter of the ring in millimeters (mm).
  • Match the measurement with the chart below.

2. Measure with Paper or String

  • Cut a thin strip of paper or use a piece of string.
  • Wrap it snugly (but not too tight) around the base of your finger.
  • Mark where the paper/string overlaps.
  • Measure the length in millimeters β€” that’s your finger circumference.
  • Match the measurement with the chart below.

πŸ“ Ring Size Conversion Chart


US / India Size Diameter (mm) Circumference (mm) UK Size
7 17.3 54.4 N 1/2
8 18.1 57.0 P 1/2
9 18.9 59.5 R 1/2
10 19.8 62.1 T 1/2
11 20.6 64.6 V 1/2
12 21.4 67.2 X 1/2
13 22.2 69.7 Z+1

✨ Tips for Accuracy

  • Measure your finger at the end of the day (fingers can swell slightly).
  • Avoid measuring when your hands are cold (they shrink).
  • If between two sizes, we recommend sizing up for comfort.

🌐 Still unsure? Contact us through our Contact Page or DM us on Instagram β€” we’ll be happy to guide you.