Screw back flat back stud earrings — 314 styles, and the line the brand is known for. The post threads into a flat disc that sits behind the lobe, so nothing catches on a pillow or a jumper. All of them state 316L surgical-grade stainless steel, all of them are rated waterproof, and all of them are made to ASTM F2923-20, the US children's jewelry standard. This is the collection to start in if you want earrings you genuinely never remove.

Statement and drop earrings — 216 styles in lightweight acetate, enamel and stainless steel. Bold enough to carry an outfit, light enough to wear for a full day. Not one of them carries a water rating, so these are the pair that comes off before the shower.

Hoop and huggie earrings — 116 styles from 8mm huggies that sit close to the lobe up to larger hoops, in gold and silver tones. Every one of the huggies is rated waterproof and made to ASTM F2923-20. The hoops are mixed — 4 of the 61 hoop styles carry a water rating — so check the one you want.

Waterproof necklaces — 77 chains, pendants and charms, all of them on 316L surgical-grade stainless steel and all of them rated waterproof. Wear them in the shower.

Also here: acetate stud earrings and bow stud earrings — lightweight push-back studs for anyone who prefers a traditional post.

Pearl earrings — 36 across studs, huggies, hoops and drops. Synthetic pearls, which is what makes an oversized hoop light enough to wear all evening.

Acetate statement earrings — 113 styles, every one of them acetate on a 316L surgical-grade stainless steel post. Acetate is why a 70mm earring can weigh almost nothing. None of them is rated for water.

Matching jewelry sets — 75 pieces designed to be worn together, eleven of them ready-made multi-piece sets rather than halves: six three-piece stacks and five stud trios.

Sports earrings and necklaces — 21 styles across eleven sports, for the player and for whoever is watching.

The word is not regulated, which is why it is worth being specific instead. 680 of the 761 styles here state a material on the product page, and every one of those 680 names 316L surgical-grade stainless steel — chosen because it holds a finish in water and does not shed nickel the way plated base metals do. Where an acetate or enamel piece states its material, that steel is the post and findings, the part that sits in the piercing.

Three things are recorded on the product itself, and they do not all reach the same number. Material on 680 of 761. A waterproof rating on 459, including every screw back stud, every necklace and 66 of the 116 hoops and huggies. ASTM F2923-20, the US children's jewelry standard, on 437, including all 314 screw back studs, 45 of the necklaces and 62 of the hoops and huggies. No statement or drop style carries either.

Nickel is the point. It is the most common cause of contact dermatitis from jewelry, and it is why ears go red, itchy or weepy after a few hours in the wrong pair. The remaining 81 styles do not state a material yet, which is the honest reason to read the specs on the style you want rather than take a collection-wide claim on trust.

Two useful reads: why waterproof jewelry is a vacation essential, and whether you can really sleep and shower in flat back earrings.

It means the piece is made from materials chosen to be unlikely to cause a skin reaction. There is no legal standard behind the word, so the useful question is what the metal is. On this page 680 of the 761 styles state a material, and all of them say the same thing: 316L surgical-grade stainless steel, worn without nickel against the skin.

Linny Co designs to be nickel-free — nickel is the most common trigger for irritated, itchy or weeping piercings. Materials are listed per style rather than claimed collection-wide: 680 of the 761 styles here state one, so check the specs on the style you want before you buy.

459 of the 761 are rated for it — shower, chlorine pool, ocean, sweat. That is all the screw back studs, all the necklaces and all the huggies. The statement and drop earrings are not: none of them carries a water rating, and acetate should be kept dry. Rinse with fresh water after saltwater or chlorine and dry before storing, and the finish lasts considerably longer.

Green marks come from copper oxidising against skin — the usual culprit is plated brass jewelry once the plating wears through. Where a style here states its material — 680 of the 761 — the post and findings are 316L surgical-grade stainless steel, which does not react that way, and that is the part that sits in your piercing. Check the specs on the style you want.

That is what the collection is for. Sensitivity is usually a nickel reaction rather than a piercing problem, so the fix is the metal. If your ears react to most earrings, start with the screw back flat back studs: all of them state 316L surgical-grade stainless steel and all of them are made to ASTM F2923-20 — no exposed catch, no moving parts, and nothing sitting against the back of the lobe.