Piercing gauge is one of those things clients rarely think about until their jewellery doesn't fit. You want to change your helix piece to a delicate gold hoop, you find something you like, and then the listing says "18g" and your piercing is "16g" — and suddenly you need to understand a numbering system that runs backwards, in a unit nobody uses for anything else.
This guide explains what gauge means in piercing, what sizes are standard for different placements, why your initial jewellery is longer than the final piece, and what downsizing actually involves. It is written by Thomas Manning, head piercer at Platinum Point in Parnell, Auckland.
What gauge means — and why the numbers run backwards
Gauge is a measurement of the thickness (diameter) of the bar or post that sits inside the fistula — not the decorative end, the total length, or the size of the gem. It is the thickness of the bit that goes through the piercing.
The gauge system used in piercing is the American Wire Gauge (AWG) system. In this system — confusingly — a higher number means a thinner bar. A 20g bar is thinner than a 16g bar. A 16g bar is thinner than a 14g bar. This is counterintuitive, but it is the universal standard used across piercing studios worldwide, including at Platinum Point in Auckland.
Common gauge sizes and their metric equivalents:
| Gauge | Diameter (mm) | Typical use |
|---|---|---|
| 20g | 0.81 mm | Very fine jewellery, some nostril pieces — thinner than most studios use for piercing |
| 18g | 1.0 mm | Fine nostril pieces, some lobe jewellery, thin decorative ends |
| 16g | 1.2 mm | Standard for most ear cartilage and many lobe piercings — the most common gauge at Platinum Point |
| 14g | 1.6 mm | Navel, nipple, some septum piercings — heavier placements that benefit from a thicker bar |
| 12g | 2.0 mm | Industrial piercings, some septum placements, stretched lobes at lower gauge |
When you are buying jewellery online or in a store, always check that the gauge matches your piercing. A 16g piece will not fit in an 18g fistula without stretching the tissue — and forcing it through is how piercing injuries happen. An 18g piece in a 16g fistula will fit loosely, move around, and can delay healing or cause irritation.
Standard gauges for every piercing placement
These are the standard gauges used at Platinum Point for each placement. Other reputable studios in New Zealand and internationally will typically match these. If a studio has pierced you at a different gauge, work with what you have — the gauge your fistula formed around is the gauge you need for fitting jewellery.
| Placement | Standard gauge | Notes |
|---|---|---|
| Lobe | 16g or 18g | Depends on anatomy and intended jewellery weight. Heavier BVLA pieces suit 16g. |
| Helix | 16g | Standard. Allows for a full range of threadless ends and rings once healed. |
| Forward helix | 16g | Labret-style post. Flat back sits flush against cartilage. |
| Tragus | 16g | Labret post. Same flat-back system as forward helix. |
| Conch | 16g | Can be worn as a ring (inner conch) or flat-back post (outer conch) once healed. |
| Daith | 16g | Curved barbell initially. Clickers and circular barbells once healed. |
| Rook | 16g | Curved barbell. Tight anatomy requires precise length. |
| Industrial | 14g | The longer bar and two-hole nature of the industrial requires a heavier gauge for stability. |
| Nostril | 18g or 16g | 18g for a delicate look, 16g for more jewellery options. Anatomy determines fit. |
| Septum | 16g | Circular barbells and clickers. Some piercers use 14g for anatomy that benefits from it. |
| Eyebrow | 16g | Curved barbell. Surface piercing — rejection risk means jewellery fit is especially important. |
| Navel | 14g | Heavier gauge handles the mechanical stress of a navel piercing better. |
| Nipple | 14g | Straight or curved barbell. Longer healing timeline requires robust jewellery. |
Why your initial jewellery is longer than the final piece
Every new piercing at Platinum Point is fitted with jewellery that is intentionally longer than the final healed piece will be. If you have just been pierced and you are looking at the bar sticking out noticeably from your skin, this is not a mistake — it is deliberate.
When tissue is pierced, it swells. This swelling is a normal inflammatory response and it affects the depth of the piercing: the tissue between the entry and exit points expands. If the initial jewellery were cut to the final healed length, the swelling would cause the disc ends to sink into and embed in the tissue. Embedded jewellery requires surgical removal.
The longer initial bar gives the swelling somewhere to go. The protruding ends sit above the skin surface regardless of how much the tissue expands.
At Platinum Point, we measure every client's anatomy before selecting initial jewellery length. The goal is the minimum length that safely accommodates expected swelling — not unnecessarily long, because excess length increases movement, and movement during healing delays the fistula from stabilising.
Once the initial swelling has resolved — typically six to sixteen weeks depending on placement — the longer bar is replaced with a shorter post in what we call the downsize appointment. This is when the length of the jewellery is brought to its final, flush-fitting dimension.
What downsizing is — and why it is not optional
The downsize is a clinical step in the healing process. It is not an optional jewellery change, and it is not something that can be safely done at home in the early weeks. Here is why it matters.
After the initial swelling resolves, the longer bar sits with several millimetres of excess length. Every time you sleep on the piercing, bump it, or move in a way that catches the jewellery, the bar shifts. That movement — the bar rocking or pivoting within the healing fistula — tears at the tissue that is actively trying to form the channel. This is the leading cause of prolonged healing timelines and irritation bumps in cartilage piercings in New Zealand.
The downsize replaces the longer bar with a post sized to the healed anatomy. The ends sit flush against the skin. There is minimal movement. The fistula can mature without constant mechanical disruption.
Downsize timelines at Platinum Point:
- Lobes: 6–8 weeks post-piercing
- Nostril: 10–14 weeks
- Helix / outer cartilage: 8–12 weeks
- Tragus: 8–12 weeks
- Conch: 10–14 weeks
- Daith: 12–16 weeks
- Rook: 12–16 weeks
- Forward helix: 8–12 weeks
We do not charge for downsize appointments for clients pierced at Platinum Point. They are part of the piercing service. Call 09 949 0940 or book online when your timeline arrives — do not wait until something feels wrong.
Jewellery length — the other measurement that matters
Gauge covers thickness. Length covers how long the bar or post is — the dimension that runs through the fistula from one side to the other.
Lengths are measured in millimetres and vary by anatomy. For flat-back labret posts (used for tragus, forward helix, conch, and lobe piercings): common lengths run from 4mm to 10mm, with 6mm and 8mm being the most frequent starting lengths. After downsizing, many lobes and forward helix piercings settle at 4mm or 5mm. Tragus and conch tend to need 5mm or 6mm for the healed fit.
For curved barbells (daith, rook): the internal diameter of the curve matters as much as the post length. The curve must follow the anatomy of the piercing rather than forcing the tissue into a different arc.
This is why buying piercing jewellery online is more complicated than it looks. A piece might be the right gauge but the wrong length for your anatomy — and a post that is even 1mm too short can create embedding pressure, while one that is 2mm too long creates unnecessary movement. When in doubt, bring the piece to Platinum Point before insertion and we will advise whether it is appropriate for your anatomy.
Threadless vs threaded vs internally threaded jewellery
The gauge discussion leads naturally to the question of what kind of end the jewellery has. Most fine piercing jewellery in 2026 uses one of three systems:
- Threadless push-fit: A decorative end with a small bent pin that presses into a hollow post. Secure, scratch-free on insertion (no external threading to catch on healing tissue), and the system used for most BVLA ends. The standard at Platinum Point.
- Internally threaded: The post has an internal socket; the decorative end has a pin with threading on it. More secure than externally threaded. Safe for healing piercings because the threading is inside the post, not dragged through the fistula on insertion.
- Externally threaded: Threading on the outside of the post — the decorative end screws onto the post directly. The threads pass through the healing fistula on insertion, catching on and damaging tissue. Not recommended for healing piercings. Common in cheap mall-kiosk jewellery.
At Platinum Point, we use threadless push-fit BVLA jewellery for final pieces and appropriately sized implant-grade titanium for starter jewellery. If you are bringing jewellery from elsewhere and want to know whether it is appropriate for your piercing stage, we are happy to advise.
Material matters as much as gauge
Getting the gauge right is necessary but not sufficient. The material must also be implant-grade for a healing or recently healed piercing. The standard materials accepted by professional piercers internationally, including at Platinum Point:
- Implant-grade titanium (ASTM F136): The best everyday starter material. Inert, lightweight, hypoallergenic, anodises to a range of colours without coatings. Our standard starting material.
- Implant-grade steel (ASTM F138): Slightly heavier than titanium. Low nickel content, but not zero — not suitable for clients with confirmed nickel allergy.
- Solid 14k or 18k gold: The benchmark for fine piercing jewellery. BVLA pieces are solid 14k or 18k gold with hand-set genuine stones. Suitable for healed piercings; can be used as starter jewellery in gold for clients who have confirmed no reaction to the alloy.
- Implant-grade niobium: Less common, but fully inert and a good option for those who react to titanium or steel.
Materials to avoid in healing piercings: surgical steel without ASTM F138 certification (many items sold as "surgical steel" in New Zealand are not implant-grade), gold-filled, gold-plated, acrylic, mystery alloys from fashion retailers, and anything without a clear material specification from the manufacturer.
Buying jewellery in Auckland — what to know
If you are buying jewellery to wear in an existing piercing — healed, not healing — you have more options. A healed fistula is far less reactive than a healing one. But even for healed piercings, low-quality materials can cause issues over time: discolouration, sensitivity, and degradation of the metal where it contacts tissue.
In Auckland, most jewellery sold in general retailers and mall accessories shops is not implant-grade and is not suitable for direct piercing use. The exceptions are dedicated piercing studios stocking appropriate materials.
At Platinum Point, we stock BVLA exclusively — Body Vision Los Angeles, solid 14k and 18k gold, handcrafted in Los Angeles since 1996. Every piece is available in a range of gauges and lengths sized to fit your anatomy. We also carry implant-grade titanium ends for starter and healing jewellery. All jewellery is fitted by Thomas or Kat — not handed across a counter.
Questions about gauge or jewellery fit?
If you are unsure what gauge your existing piercing is, or whether a piece of jewellery you own is appropriate for your piercing stage, come in to Platinum Point at 389 Parnell Road, Parnell, Auckland 1052. Jewellery consultations are available by appointment. We can measure your existing jewellery, assess your anatomy, and advise what will work.
Clients travel from across Auckland — Remuera, Newmarket, the North Shore, Ponsonby — for jewellery fitting appointments, and we see clients from Wellington and Christchurch for BVLA consultations. Call 09 949 0940 or book online at platinumpoint.nz/book.
Piercing gauge — frequently asked questions
What does gauge mean in piercing?
Gauge is the thickness (diameter) of the bar or post that sits inside the fistula. In the gauge system, a higher number means a thinner bar — 20g is thinner than 16g, 16g is thinner than 14g. This runs backwards from what you might expect, inherited from the American Wire Gauge system. Most ear piercings use 16g or 18g.
What gauge is a standard lobe piercing?
16g or 18g, depending on the studio and intended jewellery. At Platinum Point we typically pierce lobes at 16g, which allows for a wider range of jewellery options once healed — including heavier BVLA pieces. If you want delicate, very fine ends you may prefer 18g, but confirm this before being pierced.
Why is my starter jewellery so long?
The initial bar is deliberately longer to accommodate the swelling that occurs in the first weeks after piercing. If the bar were fitted to the final healed length, swelling would cause the ends to embed in the skin. Once swelling resolves — typically 6–16 weeks depending on placement — the longer bar is replaced with a shorter post in a downsize appointment.
What is downsizing and when should I get it done?
Downsizing is the appointment where your longer initial bar is replaced with a shorter post, once swelling has resolved. It is a clinical step, not an optional change. The timing at Platinum Point: lobes 6–8 weeks, nostril 10–14 weeks, helix and tragus 8–12 weeks, daith and rook 12–16 weeks. It should be done at the studio, not at home.
Can I put an 18g piece in a 16g piercing?
An 18g piece will fit loosely in a 16g fistula — the bar is thinner than the channel. This creates movement, which can irritate a healing piercing. For a fully healed piercing, a slightly thinner piece is less problematic, but the piece may rotate or shift more than a correctly sized one. For a healing piercing, always use the gauge you were pierced at.
Can I buy piercing jewellery from a shop in Auckland and put it in my piercing?
Only if it is implant-grade and the correct gauge and length. Most jewellery in general retailers and mall kiosks in Auckland is not implant-grade. For a healing piercing, use only implant-grade titanium, implant-grade steel, or solid 14k/18k gold. For a healed piercing, lower-grade materials carry less risk but can still cause long-term sensitivity. If unsure, bring the piece to a piercing studio before inserting it.