Ring Size Guide
Ring Size Guide (Comfort-Fit, Resizable 5.75–7.25)
Welcome to our Ring Size Guide. This comprehensive guide helps you measure accurately at home, understand our resizable comfort-fit system, and convert sizes internationally and also you’ll find charts, pro tips, and external jewelry resources from trusted authorities like GIA and ISO for complete confidence when buying online.
How Our Comfort-Fit Resizable Ring Size Guide System Works
- A slim and hidden spring-bar adjuster inside the band lets you micro-tighten or relax between US 5.75 → 7.25.
- It locks gently at your chosen size; consequently, the ring stays secure while sliding over your knuckle with ease.
- The comfort-fit interior feels about ¼ size roomier than a traditional flat band, providing extra comfort for daily wear.
Curious about durability? Review the GIA Mohs hardness scale. Understanding hardness helps you choose the best ring for everyday use.
Ring Size Guide Chart: Standard US Sizes & Measurements
Use this Ring Size Guide chart for precise reference and Each size includes both inner diameter and circumference (±0.1 mm tolerance) and You can cross-verify using ISO standards.
| US Size | Inner Diameter (mm) | Inner Circumference (mm) |
|---|---|---|
| 5.75 | 16.4 | 51.5 |
| 6.00 | 16.5 | 51.8 |
| 6.25 | 16.7 | 52.5 |
| 6.50 | 16.9 | 53.1 |
| 6.75 | 17.1 | 53.7 |
| 7.00 | 17.3 | 54.4 |
| 7.25 | 17.5 | 55.0 |
Formula: Circumference ≈ Diameter × π (3.1416). Learn more from the ISO 8653 Jewellery Ring Size Standard.
Measure at Home: Two Easy Ring Size Guide Methods
Method 1 — Paper Strip (Simple and Fast)
- Wrap a thin strip of paper around the base of your finger.
- Then Mark where it overlaps and measure the length in millimeters.
- Then Match your measurement to the inner circumference in our chart.
For visuals, refer to GIA’s Ring Sizing Guide.
Method 2 — Existing Ring (Accurate and Reliable)
- Measure the inside diameter of a ring that fits the same finger.
- Then Compare it to the chart above to identify your closest US size.
- Then confirm it feels comfortable using our resizable mechanism.
For an additional printable sizing tool, see Catbird’s Free Ring Sizer PDF.
Pro Tips for Perfect Ring Sizing
- Measure at the end of the day at room temperature; fingers are smaller in the morning.
- Between sizes? Choose the smaller one—our comfort-fit band already feels slightly larger.
- Wider bands (≥3 mm) can feel tighter; therefore, go ¼ size up if necessary.
- Seasonal swelling is normal; however, our resizable mechanism helps maintain comfort all year.
International Ring Size Guide Conversions
Use this chart to convert international sizes to US values and Keep in mind that diameter and circumference measurements remain the most accurate for global comparisons.
| Region | ~US 5.75 | US 6 | US 6.25 | US 6.5 | US 6.75 | US 7 | US 7.25 |
|---|---|---|---|---|---|---|---|
| UK/AU | L½ | M | M½ | N | N½ | O | O½ |
| EU (ISO) | 51 | 52 | 53 | 54 | 54.5 | 55 | 56 |
| JP | 11 | 12 | 13 | 13.5 | 14 | 15 | 16 |
Need Help Using Our Ring Size Guide?
- Message us with a photo of a ring that fits and a ruler for quick guidance.
- Then you can Ask for a free printable sizer—email us and we’ll send it right away.
- Then Chat directly via our Contact Us page for personal help.
For long-term jewelry comfort, explore our Product Care Guide, FAQs, and GIA Education on Mohs Hardness.
In summary, this Ring Size Guide offers the tools and tips to measure accurately, compare globally, and adjust easily. Because small differences can affect comfort, using these methods ensures your Apex Luxe ring always fits perfectly.
