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Buying guide

# Ring Size Charts for US, EU and UK Buyers

US, EU and UK ring sizes rarely line up. Use one measurement method and convert once, not per supplier.

TRI GEM JEWELRY Content Team·2026-03-13T16:00:00+00:00·Updated 2026-11-05T10:03:01.873000+00:00

![Sterling silver ring sizing reference](https://wp.trigemjewelry.com/images/product-ring-01.jpg)

## Measure the finger, not an old ring

Measure the finger with a ring gauge or a strip of paper at the intended position, at room temperature, because fingers change size through the day. A ring measured from an old ring reflects that ring's wear, not the current fit.

Record the measurement as an inner diameter in millimetres, then convert once to the size system your market uses.

## Converting US, EU and UK sizes

US, EU and UK sizes are different scales, and rounding between them introduces error. Keep the millimetre diameter as the master value in the order and let the supplier convert from it.

For wide bands, add allowance: a 6 mm band feels tighter than a 2 mm band at the same inner diameter.

## Sizing in bulk orders

Bulk orders are bought as a size curve. Confirm the curve, the tolerance per size and whether half sizes are available before production; changing the curve after casting means new molds or rework.

State the sizing system on the purchase order and on the packaging label so retail staff and customers read the same number.

Related reading

## Continue reading

- [Buying guideWhat to Check Before Adding a Silver Jewelry BrandBefore you add a silver line, verify the things that cause returns: specification drift, plating wear, missing compliance documents and slow replenishment.](https://wp.trigemjewelry.com/blog/best-silver-jewelry-brands)
- [Buying guideSterling Silver vs White Gold: Which Should You Stock?The two look similar in a case but behave differently in price, wear and reordering. A practical split for wholesale buyers.](https://wp.trigemjewelry.com/blog/sterling-silver-vs-white-gold)
- [MaterialsHow to Tell If Jewelry Is Real Silver: Five ChecksHallmarks, magnet tests and XRF each answer a different question. Here is what each check can and cannot prove before you place an order.](https://wp.trigemjewelry.com/blog/how-to-tell-real-silver)

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