We want finding your perfect ring size to be as simple as possible.
This guide will help you figure it out in minutes, no pressure, no fuss.
✨ A quick note before we begin:
Everyone’s fingers are a little different, and that’s normal. Sometimes you might fall between two sizes, or one finger might be slightly larger than the other. If that’s the case, we generally recommend sizing down first, especially for daintier bands. A snug but comfortable fit is often better than one that slips.
And if you don’t feel like going through sizing right now, that’s totally okay too.
We include a free ring sizer with every first order, and if your ring isn’t the right fit, we’ll exchange the size for you for free so you can wear it comfortably with confidence.
1. LUME Ring Sizes
We currently offer four sizes (three for some styles):
• US Size 5 (Inner Diameter: 15.7mm | Circumference: 49.3mm)
• US Size 6 (Inner Diameter: 16.5mm | Circumference: 51.8mm)
• US Size 7 (Inner Diameter: 17.3mm | Circumference: 54.4mm)
• US Size 8 (Inner Diameter: 18.1mm | Circumference: 56.9mm)
To convert to Australian or New Zealand sizes:
• US Size 5 = AU/NZ Size J 1/2
• US Size 6 = AU/NZ Size L 1/2
• US Size 7 = AU/NZ Size N 1/2
• US Size 8 = AU/NZ Size P 1/2
2. Easy At-Home Sizing
Already own a ring that fits you well? You’re halfway there.
Step 1: Measure the Inner Diameter:
Use a ruler or caliper to measure the inside edge of the ring in millimeters.
Step 2: Match Your Measurement:
• Compare your measurement to the chart below to find your size:
| US Size |
Inner Diameter
(approx.)
|
Circumference
(approx.)
|
AU/NZ Size |
| 5 |
15.6 – 15.8 mm
|
48.9 – 49.6 mm
|
J 1/2 |
| 6 |
16.4 – 16.6 mm
|
51.2 – 52.5 mm
|
L 1/2
|
| 7 |
17.2 – 17.5 mm
|
54.4 – 55.3 mm
|
N 1/2
|
| 8 |
18.0 – 18.3 mm
|
56.5 – 57.5 mm
|
P 1/2
|
3. Tips for Finding the Right Size
• Measure your finger at the end of the day, as your fingers may swell throughout the day.
• Avoid extreme temperatures — cold fingers can shrink, and heat can swell.
If you’re still unsure, contact us for personalized advice or use our complimentary ring sizer included with every order.
4. Still Unsure? We've Got You
Every LUME order comes with a complimentary ring sizer to help you get it right for future purchases or gifting. (Note: Due to popular demand, our ring sizer is currently out of stock, but we’re restocking and it’ll be back in early July.)
And if your ring doesn’t fit quite right? No worries, we offer one free resizing within 14 days. Just reach out and we’ll take care of the rest 🫶
