Lumora Ring Size Guide: Find Your Perfect Fit
Choosing the right ring size is just as important as choosing the perfect ring. Whether you’re buying an engagement ring, a lab-grown diamond ring, or a gift for someone special, getting the size right ensures comfort, beauty, and peace of mind.
In this ring size guide, we’ll help you measure your ring size accurately and share expert tips to make sure your ring fits perfectly.
Why Ring Size Matters
A ring that’s too tight can feel uncomfortable, while a ring that’s too loose might slip off easily. The perfect fit should slide smoothly over your knuckle but feel snug enough to stay in place.
Getting your correct size from the start also helps avoid resizing, which can sometimes affect the ring’s design or setting.
How to Measure Your Ring Size at Home
There are a few easy ways to measure your ring size :
1. Use a String or Paper Strip
-
- Wrap it around the base of your finger.
-
- Mark where the ends meet.
-
- Measure the length in millimetres.
-
- Compare it with a ring size chart (see below).
2. Use an Existing Ring
-
- Choose a ring that fits the same finger.
-
- Measure the inner diameter in millimetres.
-
- Match the measurement to the chart below.
3. Book a Free Ring Size Measurement at Lumora Diamonds
At Lumora Diamonds, we offer a free ring size measurement service to help you find your perfect fit before making your purchase.
Simply contact us to book an appointment and visit our Auckland showroom at a time that suits you.
Ring Size Chart (UK, US & EU Conversion)
| Inside Diameter (mm) | Inside Circumference (mm) | UK(NZ) Size | US Size | EU Size |
|---|---|---|---|---|
| 14.0 mm | 44.0 mm | F | 3 | 44 |
| 14.4 mm | 45.2 mm | G | 3.5 | 45 |
| 14.8 mm | 46.5 mm | H | 4 | 46.5 |
| 15.2 mm | 47.8 mm | I | 4.5 | 47.5 |
| 15.7 mm | 49.0 mm | J ½ | 5 | 49 |
| 16.1 mm | 50.3 mm | K | 5.5 | 50.5 |
| 16.5 mm | 51.5 mm | L | 6 | 51.5 |
| 16.9 mm | 52.8 mm | M | 6.5 | 52.75 |
| 17.3 mm | 54.0 mm | N | 7 | 54 |
| 17.7 mm | 55.3 mm | O | 7.5 | 55.25 |
| 18.1 mm | 56.6 mm | P | 8 | 56.5 |
| 18.5 mm | 57.8 mm | Q | 8.5 | 57.75 |
| 19.0 mm | 59.1 mm | R | 9 | 59 |
| 19.4 mm | 60.3 mm | S | 9.5 | 60.25 |
| 19.8 mm | 61.6 mm | T | 10 | 61.5 |
| 20.2 mm | 62.8 mm | U | 10.5 | 62.75 |
| 20.6 mm | 64.1 mm | V | 11 | 64 |
| 21.0 mm | 65.3 mm | W | 11.5 | 65.25 |
| 21.4 mm | 66.6 mm | X | 12 | 66.5 |
| 21.8 mm | 67.8 mm | Y | 12.5 | 67.75 |
| 22.2 mm | 69.1 mm | Z | 13 | 69 |
💡 Tip: Your fingers may slightly change size depending on temperature and time of day. Measure when your hands are warm for the most accurate result.
Finding the Right Ring Size for a Surprise
If you’re planning a surprise engagement or gift, here are a few clever ways to estimate their ring size:
-
- Borrow one of their rings (from the correct finger!) and trace it on paper.
-
- Ask their friend or family member for help.
-
- Choose an adjustable ring design or a style that can be resized easily later.
When in Doubt, Go Slightly Larger
It’s easier to resize a ring that’s a little too big than one that’s too small.
If you’re between two sizes, we recommend going up half a size — especially for rings with wider bands.
At Lumora Diamonds, we also offer a free resizing service to ensure your ring fits perfectly after purchase.
Let Us Help You Find the Perfect Fit
At Lumora Diamonds, we want every ring to feel as beautiful as it looks.
Whether you’re purchasing a lab-grown diamond engagement ring, wedding band, or a custom-made piece, our team can assist you with professional sizing advice and complimentary measurement services.
✨ Explore our collection and find your perfect fit today.
Shop Lab-Grown Diamond Rings
