7 Common Body Jewelry Sizing Mistakes (and How to Fix Them)
You found the perfect piece, ordered it, waited for it to arrive — and it doesn't fit. It's one of the most frustrating experiences in body jewelry, and it's almost always a sizing mistake, not a bad product. The good news is that every one of these mistakes is avoidable once you know what to watch for.
Here are the seven most common sizing mistakes, why they happen, and how to get it right.
1. Confusing gauge with length
This is the most common mix-up. Gauge and length are two completely different measurements, and people often order the right one of one and the wrong one of the other.
- Gauge — the thickness of the post or wire.
- Length (or diameter) — how long the post is, or how wide the hoop is.
A piece can be the correct gauge but the wrong length and still won't fit right. Always check both numbers before ordering.
2. Misreading the gauge scale
Body jewelry gauge runs backwards from what you'd expect: a higher number is a thinner post. So 20G is thinner than 18G, which is thinner than 16G. People who don't know this sometimes order an 18G thinking it's a step up in thickness from a 16G, when it's actually thinner.
| Gauge | Thickness | Typical placement |
|---|---|---|
| 20G | 0.8mm | Healed nostrils, standard earlobes |
| 18G | 1.0mm | Nostrils, earlobes |
| 16G | 1.2mm | Cartilage (helix, tragus, conch), lip |
| 14G | 1.6mm | Navel, industrial, tongue |
If you're matching your current jewelry, match the exact gauge number — and remember the scale is reversed. Our piercing sizes chart lays out every gauge clearly.
3. Measuring the wrong part for length
Length is the wearable area — the part of the post that actually sits in your piercing — not the total length of the jewelry including the decorative end or the threading. Measuring the whole piece end to end gives you a number that's too big, and the jewelry arrives too long. For a flat-back labret, that's the distance from the inside of the flat back to the base of the top setting. Measure only the part that goes through you.
4. Getting hoop diameter wrong
Hoops and rings are measured by inner diameter — the distance straight across the open inside of the hoop — and this trips a lot of people up. A hoop that's too small won't close around the piercing; one that's too big swings, catches on hair, and droops. If you love the fit of a hoop you own, measure its inner diameter and match it. Going by the look of a product photo alone is how people end up with a nose hoop that's comically large or won't fasten.
5. Ordering "standard" sizes without checking yours
There's no universal size for any piercing. While there are common starting sizes — 20G or 18G for earlobes and nostrils, 16G for most cartilage, 14G for navels — your actual piercing may differ depending on how you were pierced, your anatomy, and whether it's been stretched or downsized. Assuming "standard" without confirming your own size is a gamble. When in doubt, measure a piece that fits or ask your piercer.
6. Forgetting that healing piercings get downsized
Fresh piercings are usually fitted with a longer post to leave room for swelling. Once healed, that initial jewelry is often too long — and people reorder the same length, not realizing they should size down. If your current jewelry has visible extra post or moves around a lot, you may be due for a shorter length. Our guide on when to downsize walks through how to tell.
7. Mismatching the threading system
Not strictly a "size" issue, but it's the other reason ordered jewelry doesn't fit together: threadless ends don't work on threaded posts, and internal and external threading aren't interchangeable. If you're buying an end and a post separately, they have to be the same system and the same gauge. A 16G threadless end needs a 16G threadless post.
How to get it right every time
The reliable method is simple: measure a piece of jewelry that currently fits you well — calipers are ideal — and match its gauge, length or diameter, and threading system. If you don't have a piece that fits, your piercer can tell you your sizes. And buy from somewhere that lists gauge, length, and material clearly on every product — if those specs are missing, that's your cue to shop elsewhere. For a body-safe piece that arrives right the first time, every item in our implant-grade titanium collection lists full specs.
Frequently asked questions
What's the difference between gauge and length?
Gauge is the thickness of the post; length (or diameter, for hoops) is how long or large the piece is. They're separate measurements and you need both correct for a proper fit.
Why is a higher gauge number thinner?
Body jewelry inherited an inverse scale from older wire-gauge systems, where larger numbers correspond to thinner wire. It's counterintuitive but consistent: 20G is thinner than 16G.
How do I measure a hoop?
By inner diameter — the distance straight across the open inside of the hoop, edge to edge. Match it to a hoop that fits you, rather than guessing from a photo.
My new jewelry is the right gauge but won't sit right — why?
It's usually a length issue (too long or too short for your piercing) or a threading mismatch. Check that the wearable length matches a piece that fits, and that the threading system is the same.
Should I order the same size I was pierced with?
Not always. Fresh piercings are fitted longer to allow for swelling, so once healed you may need a shorter length. If your jewelry has extra post or moves a lot, you're likely due to downsize.
This blog is for educational purposes and isn't a substitute for advice from your piercer. For sizing on a fresh or sensitive piercing, check with a qualified professional.