Printable Ring Sizer

Use this guide with a ring that already fits the finger you plan to wear your Lunéa Paris ring on. The circles below are drawn to physical millimeter dimensions and are intended to be printed at true size.

Before printing
  • Use either US Letter (8.5 × 11 in) or A4 (210 × 297 mm) paper in portrait orientation.
  • Set print scale to 100% / Actual Size.
  • Turn off “Fit to page,” “Shrink oversized pages,” or other automatic scaling.
  • After printing, verify the scale marks below with a ruler before using the ring circles.

1. Verify the printed scale

Measure either line with a ruler. If the line does not match the stated length exactly, adjust your printer settings and print again.

50 mm check
Must measure exactly 50 mm
2 inch check
Must measure exactly 2 inches

2. Match your ring to a circle

Place a ring that already fits flat over the circles. Look straight down and match the inside edge of your ring to the printed circle. The printed circle should sit just inside the ring with as little visible gap as possible.

US 3 14.1 mm
US 3.5 14.5 mm
US 4 14.9 mm
US 4.5 15.3 mm
US 5 15.7 mm
US 5.5 16.1 mm
US 6 16.5 mm
US 6.5 16.9 mm
US 7 17.3 mm
US 7.5 17.7 mm
US 8 18.1 mm
US 8.5 18.5 mm
US 9 19.0 mm
US 9.5 19.4 mm
US 10 19.8 mm
US 10.5 20.2 mm
US 11 20.6 mm
US 11.5 21.0 mm
US 12 21.4 mm
US 12.5 21.8 mm
US 13 22.2 mm

If you are between two circles: start with the larger size, especially for wide bands or eternity styles. For another check, use the Lunéa Paris on-screen ring sizer.

Diamond ring on water with a dark blue background

Lunéa Paris

Who We Are

Lunéa Paris was created with one goal: make modern luxury feel personal. Pieces that look unforgettable, feel comfortable, and carry meaning—whether it’s a gift, a milestone, or a promise.

We choose lab-grown diamonds for their brilliance and our belief in a better way forward. Each design is crafted with intention and finished with precision—so your jewelry feels just as special years from now.

  • Brilliance you can feel
  • Made with love
  • Design-first craftsmanship
  • Responsible by choice
  • Made for everyday elegance