Item guides

Buying Hoop Earrings Online: Six Checks for Inner vs Outer Diameter

A 10 mm inner diameter is not the same measurement as a 10 mm outer diameter. Compare Astrid & Miyu's inner-diameter chart with Mejuri's product-specific outer diameters, then check hoop thickness, closures and whether a listing is single or a pair.

5 min read2026-10-27

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OriginalMejuri product dimensions: 16 mm outer diameter and 7 mm widthMejuri — Chunky Medium Hoops · Original publisher

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01

What you need

Ruler with millimeter marks
A comfortable existing hoop if available
Product specification pages
Return and exchange policy

02

How to

1. Look for 'inner diameter' (inside edge to inside edge) or 'outer diameter' (widest outside edge) beside the millimeter figure. These measurements differ, and not all brands label sizes in the same way.
2. If you have a comfortable hoop, lay it on a flat surface and measure both its inner opening and outer width. Record both numbers instead of estimating size from a styled photo.
3. Compare like with like using the specific maker's chart. Astrid & Miyu groups huggies at 6.5–9 mm, small at 9.1–11.9 mm and medium at 12–19 mm, all measured as inner diameter. Do not apply those bands to another brand's outer-diameter figures.
4. Read hoop thickness, shape and closure details as well. For example, one Mejuri hoop lists a 12 mm outer diameter and 1.3 mm thickness; a chunkier model lists 16 mm outer diameter and 7 mm width. Similar circles can have very different visual volume.
5. Check whether the listing is for one earring or a pair and whether it is appropriate for your piercing stage. A particular Astrid & Miyu 6.5 mm hoop says 'for healed piercings only'; ask a qualified piercer if suitability is unclear.
6. Before paying, note diameter type, thickness, quantity and return terms, and compare them with a hoop that already feels comfortable. Avoid a very tight ring that would pinch your ear rather than assuming it will fit later.

One more tip

Astrid & Miyu's huggie 6.5–9 mm and small 9.1–11.9 mm bands are its own inner-diameter categories. The 12 mm and 16 mm figures on the cited Mejuri products are outer diameters. Never compare these labels as though they used the same measurement.

Sources and media

OriginalAstrid & Miyu's hoop inner-diameter size chartAstrid & Miyu — Earrings Size Guide · Original publisher

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