A size label is a starting point, not the whole fit. Ring width, necklace placement, bracelet construction, and the way a piece moves all affect comfort. Measurements make those differences easier to judge than photographs alone.
Use the tables below as approximate references, then compare with the sizing information for the individual design. This page provides static charts rather than an automatic size converter.
Ring Size Conversion Chart
Ring sizes use different systems across markets. US sizes use numbers, UK sizes commonly use letters, and many European labels refer to inner circumference in millimeters. Regional charts and rounding conventions can differ, especially at half sizes.
The table keeps the approximate US sizes and inside diameters as a reference. Circumference is calculated from the rounded diameter using circumference = diameter × π; it is not an exact certification of a regional size. For another sizing system, match the measured millimeters against the seller’s own chart rather than assuming a universal country-to-country equivalent.
| Approximate US size | Inside diameter (mm, approx.) | Calculated inside circumference (mm, approx.) |
|---|---|---|
| 4 | 14.9 | 46.8 |
| 4.5 | 15.3 | 48.1 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.8 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.3 |
| 7.5 | 17.7 | 55.6 |
| 8 | 18.1 | 56.9 |
| 8.5 | 18.5 | 58.1 |
| 9 | 18.9 | 59.4 |
| 9.5 | 19.4 | 60.9 |
| 10 | 19.8 | 62.2 |
| 10.5 | 20.2 | 63.5 |
| 11 | 20.6 | 64.7 |
| 12 | 21.4 | 67.2 |
Measuring a Ring You Already Wear
Choose a round ring that fits the intended finger and hand. Measure straight across the inside of the opening at its widest point, excluding the metal walls. A precise ruler can provide an estimate, while calipers or a jeweler’s measurement can be more reliable.
A ring that is bent, unusually shaped, or much narrower than the design you plan to wear may not provide a useful comparison. Check the inside profile as well as the diameter.
Measuring Your Finger
A ring sizer close to the width of the intended band gives a better indication than loose string. Paper and string can twist, stretch, or compress the finger, so use them only for a rough estimate rather than a final size for a precise order.
- Measure the intended finger on the intended hand; the matching finger on the other hand may differ.
- Measure at a comfortable temperature and repeat at different times, since fingers can change size during the day.
- Check that the ring passes over the knuckle with some resistance and sits comfortably at the base without pinching.
- If you are between sizes, compare the actual band width and profile instead of automatically choosing the larger one.
Wide bands and several stacked rings can feel tighter than a narrow band. If the fit is uncertain, have the finger measured with a comparable ring sizer before confirming engraving or another change that limits returns.
Necklace Length Size Chart
Necklace length tells you the chain measurement, not exactly where it will sit on every wearer. Neck circumference, body proportions, clothing, and pendant dimensions affect placement. Style names such as “choker” or “opera” also cover ranges rather than one universal length.
| Chain length (inches) | Approximate length (cm) | What to consider |
|---|---|---|
| 14" | 35.6 | May fit close to the neck; check neck circumference and room for comfortable movement. |
| 16" | 40.6 | A shorter option; compare its position with the wearer’s neckline. |
| 18" | 45.7 | A common pendant-chain length, with placement varying by wearer. |
| 20" | 50.8 | Provides more length for a pendant or separation from a shorter chain. |
| 24" | 61.0 | A longer option; check where the pendant falls against clothing. |
| 30"+ | 76.2+ | Can create a long line; suitability for doubling depends on the design and fit. |
Measure a favorite necklace from end to end with its clasp included, following the seller’s measuring convention. Check whether a product’s stated length includes an extender and whether a pendant drop is measured separately.
A piece of string can help you picture the position against an outfit. For layering, account for the pendant’s size and movement rather than relying only on the difference between chain lengths.
Bracelet Size Chart
Measure around the wrist where the bracelet will sit, keeping the tape snug without pressing into the skin. That wrist measurement is different from the finished bracelet length.
The ranges below illustrate adding about 0.5–1 inch, or roughly 1.3–2.5 cm, for a loose chain-style fit. They are examples, not a rule for every bracelet. Follow the maker’s instructions for the particular clasp, thickness, and construction.
| Reference group | Wrist (inches) | Wrist (cm, approx.) | Example chain length (inches) |
|---|---|---|---|
| XS | 6.0" | 15.2 | 6.5–7.0" |
| S | 6.5" | 16.5 | 7.0–7.5" |
| M | 7.0" | 17.8 | 7.5–8.0" |
| L | 7.5" | 19.1 | 8.0–8.5" |
| XL | 8.0" | 20.3 | 8.5–9.0" |
XS, S, M, and other labels are not standardized across makers. Beads, added charms, and thick links can reduce the usable space inside a bracelet. Cuffs and rigid bangles need different measurements; a closed bangle also has to pass over the hand.
Before Choosing a Size
Read the dimensions for the actual design, including adjustment ranges and any instructions about band width, charms, or extenders. A familiar size label from another brand may not give an identical fit.
For gifts, check exchange and resizing options before confirming the choice, especially when personalization is involved. The Jewelry Gift Guide covers other practical details, while the stackable jewelry guide explains fit and contact between pieces worn together.