Measured: Solid precious metal is declared by a fineness stamp, karat for gold and parts per thousand for silver. A plated finish is declared instead by its coating thickness in microns.
The basics
What to know about body jewelry
It sits inside the piercing
Body jewelry sits inside a piercing rather than hanging off it. That means every piece is sized to a channel through skin or cartilage instead of to a look. Two numbers carry that sizing. Gauge measures the thickness of the bar or wire on an inverted scale, where a lower number means thicker metal. 20 gauge is 0.8 mm, 18 gauge is 1.0 mm, 16 gauge is 1.2 mm, 14 gauge is 1.6 mm, and 0 gauge is 8 mm. Length is the second figure, and on a bar it means wearable length, the gap between the inside faces of the two ends rather than the total including the balls. Rings drop length and use inner diameter, the width of the open circle. Miss either number and the piece either will not pass through the hole or presses on tissue never built to carry it.
Threading and how it feels
Fastening is the part you feel, and three systems cover almost everything sold. Externally threaded bars cut a screw thread into the shaft. That is why sharp ridges travel through the piercing channel on every change and shred healing tissue on the way. Internally threaded bars invert that: the shaft is hollow and tapped, the decorative end carries the small pin, and the surface passing through you stays smooth. Threadless jewelry, also sold as press fit, drops the thread entirely, using a slightly bent pin that grips inside a hollow post by spring tension. This makes it the fastest to change and the kindest to a new piercing. Rings solve the same problem three other ways: captive bead rings trap a ball with the spring of their own gap, clickers hinge open and snap onto a machined post, and seamless rings twist sideways to open. Finish counts as much as mechanism, since a mirror polished bar with no visible seam gives bacteria nothing to lodge against.
Gauge and length by placement
Placement sets the numbers far more than taste does. Nostrils are usually pierced at 18 or 16 gauge, most ear cartilage and septums at 16, and navels, nipples and tongues at 14, though a piercer measuring you beats any chart. Initial jewelry gets fitted long on purpose, often 3 to 5 mm past what you will eventually wear, so swelling has somewhere to go. Healing spreads very widely by placement: a lobe often settles in two to three months, a nostril or a navel can run six months to a year, and cartilage sits at the slow end of every range. Treat those as ranges rather than promises and let your piercer confirm. First jewelry should be implant grade titanium, niobium or solid gold between 14k and 18k, in a threadless or internally threaded design. Chains, dangles, heavy clickers and anything plated belong on a piercing that has been quiet for months.
Where reactions start
Each of those choices takes something back. Cheap plated jewelry is where most reactions begin, because a few microns of gold color over a nickel bearing base metal wear through at exactly the spot sitting inside you. Nickel is the most common contact allergen there is. European rules cap nickel release from anything inserted into pierced skin at 0.2 micrograms per square centimeter per week, a limit no unlabeled base metal can prove it meets. Color is better bought through anodized titanium, which grows an oxide layer on the metal itself instead of adding a coating that flakes. Weight sets the second bargain, since a dangle that catches light also catches on clothing. A piercing tugged daily builds scar tissue or migrates. Stretched lobes carry the largest one of all: past roughly 10 mm, which is 00 gauge, many lobes never shrink back to a small hole and surgery becomes the only route to closing them.
Run a fingernail along the bar
Quality shows up under a fingernail faster than under a loupe. Slide your nail slowly along the bar and around each end, then reject anything with a seam, a burr or a step, because that ridge is what scrapes a channel open. Read the material claim for a numbered standard rather than an adjective: ASTM F136 or F1295 titanium, ASTM F138 steel, or a stated karat of solid gold all mean something, while surgical grade, medical grade and hypoallergenic are uncontrolled words. Press a threadless pin home and pull straight out, expecting real resistance. Clickers should shut with one clean click and no side to side rock at the hinge. Roll a ring on a flat surface and watch the ends meet, since a ring that no longer closes flush will pinch skin into the gap.
Leaving a new piercing alone
Keeping a piercing calm is mostly a matter of leaving it alone. Rinse once or twice daily with sterile saline at 0.9 percent sodium chloride, pat dry, and keep alcohol, hydrogen peroxide, tea tree oil and twisting away from it, since all four damage new tissue. Book a downsize once the first swelling drops, often somewhere between two and eight weeks, because a bar left long swings and snags. Unscrew threaded ends every few weeks and wash both halves in warm soapy water. Throw out plated pieces the moment color goes patchy at the ends. Spreading redness, heat, throbbing, thick discharge or a fever means stop guessing and see a doctor, and jewelry that has embedded or will not turn is a same day trip to your piercer.
Buyer checklist
Before you buy body jewelry
Separate appearance from material value. Metal, finish, stone details and aftercare matter more than a style name alone.
01
Confirm the material
Look for clear wording such as solid, sterling, filled, vermeil, plated or tone. These terms describe different constructions and wear lives.
02
Ask what is treated or lab-grown
Stone identity, treatments and laboratory origin should be disclosed when they affect value or care.
03
Check dimensions and weight
Chain length, hoop diameter, ring width, watch case size and total weight change comfort as much as appearance.
04
Review service and returns
Check resizing, battery or movement service, plating repair, warranty exclusions and the return rules for personalized pieces.
Measure jewelry you already wear with a digital caliper instead of guessing. A 1.2 mm bar is 16 gauge and a 1.6 mm bar is 14 gauge. Wearable length means the distance between the inside faces of the two ends, not the full length with the balls.
Size a ring by inner diameter, the width of the open circle. A 16 gauge septum clicker at 8 mm tucks inside the nostrils, 10 mm hangs level with them, and a nipple ring usually wants 12 to 14 mm.
Check the downsize once the first swelling has gone: look at how much bare bar shows past your skin. More than about 2 mm at each end means the piece is snagging and a shorter bar is due.
Choose a disc of 4 to 5 mm on a flat back stud, then look at it after ten minutes of wear. The disc should rest flush, and a ring of pressed pink skin around it means the post is too short.
Sit down and fold forward before settling on a navel bar. If the standard 10 mm curve digs into the crease, ask for a longer bar or a flexible one.
Go up one gauge size only when stretching, a fraction of a millimeter at common lobe sizes, and let the piece slide in with lubricant and light pressure. Anything needing force or drawing blood is at least four weeks too early.
Care
Caring for body jewelry
Rinse a healing piercing once or twice a day with sterile saline at 0.9 percent sodium chloride, then pat it dry. Over cleaning strips the new tissue as surely as not cleaning it at all.
Keep alcohol, hydrogen peroxide, antibacterial soap and tea tree oil off a piercing, and stop turning or twisting the jewelry. Each of those kills the cells rebuilding the channel and adds weeks to healing.
Take threaded jewelry apart every few weeks and wash both halves in warm soapy water. Skin cells and sebum pack into the joint between the end and the bar, and that buildup is what makes a piercing smell.
Get the bar downsized once the first swelling settles, often between two and eight weeks. A bar still at healing length swings and catches on clothing, which drives the irritation bumps most people blame on the metal.
Retire plated jewelry the moment color goes patchy at an end. What sits under that gold tone is usually a nickel bearing base metal, and it is now touching the inside of your piercing directly.
See a doctor for spreading redness, heat, throbbing pain, thick discharge or a fever, and see your piercer the same day if jewelry has embedded or will not move. Neither one is something to wait out.
Questions
Common questions
How do I know what gauge my piercing is?
Measure the jewelry currently in it with a digital caliper. 1.6 mm is 14 gauge, 1.2 mm is 16 gauge, 1.0 mm is 18 gauge and 0.8 mm is 20 gauge. Remember the scale runs backward, so a lower number means a thicker bar. Without a caliper, your piercer can read it in seconds and will usually do it for nothing.
Which metals are safe in a piercing that is still healing?
Implant grade titanium to ASTM F136 or F1295, niobium, and solid gold between 14k and 18k are the standard answers, ideally in a threadless or internally threaded design. Steel to ASTM F138 suits many people but contains nickel in the alloy. Terms like surgical grade, medical grade and hypoallergenic are not controlled, so ask for the numbered standard or the karat instead.
How long before I can change my jewelry?
Placement decides this far more than you do. Lobes often settle in two to three months, nostrils and navels in six months to a year, and cartilage can take a year or more. Treat those as ranges rather than deadlines and have your piercer look before you swap anything, because changing early reopens the channel and invites infection.
Why is there a bump next to my piercing?
Most bumps are irritation rather than infection. The usual causes are a bar left too long and catching, sleeping on the piercing, cheap metal, or a knock. Fix the cause first: downsize the bar, move to implant grade titanium, stop touching it. A bump that is hot, spreading, painful or leaking thick fluid needs a doctor, not a home remedy.
Is gold plated body jewelry safe to wear?
Not in a healing piercing, and only carefully in a settled one. Plating runs a few microns thick and wears through where metal rubs inside you, exposing base metal that usually carries nickel. Solid gold at 14k to 18k costs more and never wears through, since the color goes all the way in. If you do wear plated, replace it once the color patches.
What is the difference between internally threaded and threadless?
Threads cut inside the hollow bar make jewelry internally threaded, and the decorative end screws in on a small pin. The shaft passing through you stays smooth. Threadless jewelry uses a bent pin that grips inside the bar by spring tension, with no thread at all. Both are good. Avoid externally threaded bars, whose cut ridges scrape the channel on every change.
How big can I stretch and still have the hole close?
Below about 10 mm, which is 00 gauge, most lobes shrink back a long way over several months, though rarely to nothing. Above that, many will not close on their own and surgery becomes the repair. Pace protects you either way: one size at a time with four to eight weeks between steps keeps the tissue thick enough to recover.
How do I get a captive bead ring back in by myself?
Most people cannot at 14 gauge, and that is normal rather than a failure of technique. Ring opening pliers are the right tool, and closing pliers put the tension back afterward. Fingers and scissors overstretch the ring, which then never grips the bead again. If you change jewelry often, a hinged clicker does the same job with no tools.
