Piercing Gauge Explained
Gauge is the single most important number in piercing jewellery, because it is the one that has to match your piercing exactly. It measures the thickness of the post or wire, and it works in a way that catches everyone out at first: the bigger the number, the thinner the jewellery. Here is how gauge works and the common sizes.
Vanhess sells piercing jewellery in Coquitlam; we do not perform piercings. Get pierced at a professional studio, then use these guides to choose safe, well-fitted jewellery from us.
The backwards scale
Gauge measures thickness, but the numbering runs in reverse. An 18 gauge (18G) post is thinner than a 16G, which is thinner than a 14G. It is a leftover from old wire-manufacturing scales, where the number counted how many times the wire was drawn thinner. So when you see gauges listed, remember: higher number, thinner jewellery. Most piercing jewellery falls between 20G (quite thin) and 14G (chunky), with 16G being one of the most common all-round sizes.
Common gauges by piercing
Different piercings use different standard gauges. Earlobes are often 20G to 16G. Most ear cartilage, like the helix, tragus, and conch, is commonly 16G, sometimes 18G. The tongue, navel, and nipple are usually 14G, a bit thicker for stability. The septum is commonly 16G or 14G. These are typical ranges, not rules, and your piercer sets the actual gauge, so the safest move is always to match the gauge you were pierced at.
Why matching gauge matters
Gauge is not a preference, it is a fit. Jewellery thinner than your piercing will move around in the channel, which irritates it and can let the hole shrink. Jewellery thicker than your piercing simply will not fit without stretching the hole, which should only be done gradually and deliberately. So when you buy a replacement, matching the gauge is the first thing to get right, ahead of length, style, or material.
Common gauges
| Gauge | Thickness and typical use |
|---|---|
| 20G | About 0.8 mm; thin, some lobes and nostrils |
| 18G | About 1.0 mm; lobes, some cartilage and nostrils |
| 16G | About 1.2 mm; most ear cartilage, septum |
| 14G | About 1.6 mm; tongue, navel, nipple, septum |
What to check when you buy piercing jewellery
Whatever the piece, a few checks keep you safe and comfortable:
- Reputable seller. Buy from a shop that states the material and standard clearly, not a market stall or a mystery online listing.
- The right material. For anything worn in a piercing, choose implant-grade titanium or solid nickel-free gold, and avoid plated or unmarked metal.
- Correct gauge and size. Match the gauge of your piercing and the length or diameter of the placement, so the piece fits without moving or pressing.
- Smooth fittings. Choose threadless or internally threaded jewellery, with a glass-smooth finish and no rough edges or casting pits.
- Ask if unsure. If you cannot tell what a piece is made of or whether it fits, bring it in and we will check it for you.
Common mistakes to avoid
- Cheap or plated metal. Nickel and worn plating cause most "my piercing is reacting" problems. Stay with implant-grade titanium or solid gold.
- The wrong size. A piece that is too long, too short, or the wrong gauge moves, snags, or presses. Match your gauge and get the length or diameter right.
- Changing too early. Swapping jewellery before a piercing is fully healed is a top cause of bumps. Wait for your piercer's go-ahead.
- Externally threaded posts. Screw threads on the outside of a post drag through the piercing. Choose threadless or internally threaded instead.
Fresh versus healed piercings
What you can safely wear depends on whether the piercing is still healing. For a fresh piercing, keep to the safest materials, implant-grade titanium or solid nickel-free gold, in a smooth threadless or internally threaded fitting, and expect it to be fitted a little long or large to allow for swelling, then downsized by your piercer once that swelling settles. During this window, do not change the jewellery yourself or switch to a decorative piece that has not been checked. Once a piercing is fully healed, your options open up: more styles, a wider range of safe metals, and easy changes you can do yourself with clean hands. When in doubt about whether a piercing is ready, ask a professional rather than risk a setback.
Aftercare in brief
Whatever you wear, a healing piercing needs the same simple routine: clean it once or twice a day with sterile saline, keep your hands off it, do not twist or remove the jewellery, and leave it in until a professional says it is healed. Stay out of pools, hot tubs, and lakes, and avoid knocks and sleeping on it in the early weeks. Most trouble comes from cheap metal or the wrong size rather than too little cleaning, so the jewellery you choose matters as much as the routine. Our aftercare guide has the full method, and our guide to bumps versus infection covers what to watch for.
Key Points
- Gauge measures thickness, and the scale runs backwards: bigger number, thinner jewellery.
- Most piercing jewellery is between 20G and 14G, with 16G a common all-round size.
- Different piercings use different standard gauges; your piercer sets the actual one.
- Always match your piercing's gauge, since too thin moves and too thick will not fit.
Frequently Asked Questions
What does gauge mean in piercings?
Gauge is the thickness of the jewellery's post or wire. The scale runs backwards, so a higher number is thinner: 18G is thinner than 16G, which is thinner than 14G. Matching your piercing's gauge is essential for a proper fit.
Why is a higher gauge number thinner?
It is a leftover from old wire-manufacturing scales, where the number counted how many times the wire was drawn thinner. So the bigger the gauge number, the thinner the jewellery. It is counterintuitive, but it is the standard everyone uses.
What gauge is my piercing?
It depends on the placement and what your piercer used: lobes are often 20G to 16G, most ear cartilage 16G, and the tongue, navel, and nipple usually 14G. The reliable answer is the gauge you were pierced at, so ask your piercer or have a current piece measured.
Can I put thinner jewellery in my piercing?
You can physically fit it, but it is not a good idea. Jewellery thinner than your piercing moves around in the channel, which irritates it and can let the hole start to shrink. Match your gauge rather than going thinner.
What if I want thicker jewellery than my gauge?
Going thicker means stretching the piercing, which should be done gradually and deliberately, only on a healed piercing, ideally with a professional. You cannot simply force a thicker gauge in without risking a tear. For normal wear, match your existing gauge.
Sources
- Association of Professional Piercers — Jewelry for Initial Piercings
- Association of Professional Piercers — Aftercare
General information, not medical advice. See a professional piercer for the piercing itself. Reviewed 20 July 2026.
Visit Vanhess
Bring in a piece and we will measure its gauge for you, at 2929 Barnet Highway, Unit 2424 in Coquitlam. Browse our piercing jewellery, or call +1 (604) 653-6449. See the length and diameter guide next.