Measured: Length is measured end to end with the clasp fastened and the chain laid flat, pendant drop excluded. Princess at 18 inches is what a chain is sold at unless a listing says otherwise.
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.
Measured: Hardness is quoted on the Mohs scale from 1 to 10, a scratch ranking in which each material marks everything softer than itself and diamond alone reaches 10.
The basics
What to know about necklaces
Length decides everything
A necklace is a loop worn around the neck, and length is the number that decides everything else about it. Sellers measure end to end with the clasp included, so a chain sold as 18 inches gives you an 18 inch circle. On an average adult neck, 16 inches closes at the base of the throat, 18 inches rests on the collarbone, 20 to 24 inches lands between the collarbone and the top of the bust, 30 inches reaches the sternum. Anything from 36 inches up will wrap twice. Traditional names sit on top of those numbers, running collar, choker, princess, matinee, opera, rope. Trust the inches, because those names drift by an inch or two between makers.
Three ways a necklace is built
Three ways of building cover almost everything on sale, and each one fails in its own way. Linked metal comes first: separate links closed and ideally soldered, flexible in every direction, asking nothing of you for decades. Strung pieces come second, with drilled beads or pearls threaded onto silk or nylon, where the thread carries the whole load and stretches with body oil until it lets go. Formed pieces are third, a shaped band of metal, leather or ribbon that holds its own curve. Within linked metal, one question beats the link pattern for importance: solid or hollow. Hollow tube chain gives you roughly three times the apparent thickness per gram of gold, then flattens permanently the first time it catches in a car door. Solid links cost more per inch and shrug off the same knock.
Clasps are what actually break
Hardware is where necklaces actually break. A spring ring closes with a thin sprung wire gate and is the most common failure in the whole category, because grit works into the gate until it stops seating. Lobster clasps use a wider lever and a stronger spring, so ask for one on anything you would be sorry to lose. Inspect the small jump ring joining clasp to chain as well, since it runs thinner than the links beside it and wears through first. For the metal, a stamp on the clasp tag tells you what you own. 925 is sterling silver, 585 is 14k gold, 750 is 18k. No stamp means plated base metal, and plating is sold by thickness in microns, with vermeil in the US requiring at least 2.5 microns of 10k or better gold over sterling silver.
Match the length to your neckline
Your neckline decides which length reads. A scoop or a V leaves skin from throat to sternum. An 18 inch pendant sits in open space and a layered necklace shows every strand you paid for. Crew necks and turtlenecks swallow anything under 20 inches. Here, matinee and opera lengths do real work by falling onto the knit itself. For a first piece, or a gift with no information, an 18 inch chain necklace or a pendant is the safe call. Unreadable formal dress codes favor a pearl strand at 16 to 18 inches. Deep necklines and open backs suit a lariat, which lets you set the drop each time. When one piece has to carry the outfit, a statement necklace does that, and when it has to carry meaning, a locket or an initial necklace does.
What length and weight cost
Every gain costs something you can name. Length that flatters an open neckline vanishes under a collar. Weight that makes a chain feel valuable is the same weight that saws through a fine bail, the loop a pendant hangs from. Chains under 1 mm layer beautifully and snap when a sweater catches one. Money is the version of the same bargain: at a given price you buy visible size or you buy metal that survives, and nobody sells both. Fashion pieces are built to be worn hard for two seasons and replaced. Solid gold and sterling silver are built to be repaired, resized and handed on. A broken 14k chain goes to a jeweler and a broken plated one goes in the bin.
Let it hang and watch
Judging a necklace takes about a minute in your hands. Hold it by one end and let it hang: a well made chain falls straight. A badly finished one corkscrews and will keep corkscrewing on your neck. Compare the clasp to the piece it holds, because a tiny spring ring under a heavy chain is a lost necklace. Press two or three stones on anything set, and treat movement as glue already letting go. With pearls, rub two gently together and feel for faint grit, which real nacre, the layered coating on a pearl, has and a coated glass bead does not.
Storing it without tangles
Storage decides a necklace's life more than wearing it does. Fasten the clasp before you set a chain down and give each piece its own hook or pouch, because a closed loop cannot knot itself and metal against metal is how scratches accumulate. Perfume, hairspray, sunscreen and sweat are what dull plating and eat pearl surfaces, so jewelry goes on last and comes off first. Chlorine attacks the copper and silver alloyed into gold and leaves links brittle enough to fail at a solder joint. So gold comes off before a pool. A yearly look at the clasp and its jump ring on anything you wear daily catches the thinning that gives no warning.
Buyer checklist
Before you buy necklaces
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.
Lay a necklace you already like flat and measure it end to end with a tape, clasp included. Buy that number, since length names shift between makers and the inches never do.
Try lengths against your own body before ordering: hold a tape at 16, 18 and 22 inches in front of a mirror. On most adults 16 inches closes at the throat, 18 inches lands on the collarbone, and 22 inches sits mid chest.
Add 2 inches to a standard length if your neck measures more than 15 inches around. A 16 inch necklace on a 15 inch neck has almost no slack and rides up every time you turn your head.
Leave at least 2 inches between strands when you layer. At 1 inch the rows read as one thick band and the chains rub against each other all day.
Match chain gauge to pendant weight. A pendant over about 5 grams needs a chain of 1.5 mm or thicker, because a fine chain wears a groove in the bail, the loop the pendant hangs from, and eventually parts.
Choose a 2 to 3 inch extender chain on collar, choker and bib shapes. Those sit right only within a narrow window, and an extender is the only adjustment a fixed loop has.
Care
Caring for necklaces
Put a necklace on after perfume, hairspray, sunscreen and lotion have dried. Those products carry alcohols and oils that dull plating and etch the surface of a pearl.
Close the clasp before a chain goes into a drawer, and hang or bag each piece separately. Chains left open braid themselves together, and undoing a knot in a 1 mm chain often costs a bench fee larger than the chain's price.
Take gold and silver off before a pool or a hot tub. Pool chemistry goes after the copper and silver alloyed into gold and leaves the links brittle enough to snap at a solder joint.
Wipe sterling silver with a dry soft cloth after each wearing. Tarnish is a surface reaction with sulfur in the air, and lifting it early stops it settling into the gaps between links.
Wash a metal chain every few months in warm water with a drop of dish soap, then dry it completely. Skin oil packs into the links and is what turns a bright chain gray.
Have the clasp and its jump ring checked once a year on anything you wear daily. That small ring thins from constant movement and opens with no warning.
Questions
Common questions
What length necklace should I buy as a gift?
Choose 18 inches. It sits on the collarbone on most adults, clears almost every neckline, and is the length pendants are designed around. A pendant will hang where the maker intended. If the person wears high necklines most days, step up to 20 or 24 inches so the chain falls onto the knit instead of vanishing under it.
How do I stop layered necklaces from tangling?
Space the strands at least 2 inches apart and vary the weight. This puts the heavier chain on the longer length so it hangs below rather than riding over the fine one. Snake and herringbone weaves tangle worst, so keep those on their own. A layered necklace sold as one piece solves the problem outright, since the spacing is fixed at the clasp.
Will a gold plated necklace turn my neck green?
It can. Plating is a thin layer over brass or another base metal. Once sweat wears through it the copper underneath reacts with skin acids and leaves a green mark. The mark washes off and is harmless. Vermeil lasts longer because US rules require at least 2.5 microns of gold over sterling silver rather than over brass.
Can a broken chain be repaired?
Solid gold, sterling silver and platinum chains are repaired routinely. A jeweler solders the link or fits a new one, usually for a modest bench fee. Hollow chains are much harder, because heat collapses the thin walls. Plated chains are rarely worth repairing, since soldering burns off the finish and leaves a bare patch you cannot match.
What is the difference between solid gold, gold filled and gold plated?
Solid gold is gold alloy the whole way through, stamped 585 for 14k or 750 for 18k, and it never wears off. Gold filled bonds a layer that is at least one twentieth of the item's weight in gold, so it lasts years of daily wear. Gold plated is a microns thin bath deposit that rubs off at the clasp and the back of the neck first.
How often does a pearl strand need restringing?
Every one to two years if you wear it weekly, and sooner if you can see thread showing beside the knots or the pearls have started to sag apart. Silk absorbs body oil and stretches, and a strand that snaps unknotted scatters every pearl. Knots between pearls limit a break to a single lost bead.
Does sterling silver bother sensitive skin?
Sterling is 92.5 percent silver with the rest usually copper, so it contains no nickel and most people wear it without trouble. Reactions usually trace to nickel in a plated base metal or in a clasp. Look for a stated alloy rather than the word hypoallergenic, which carries no regulated meaning in the US and guarantees nothing about nickel content.
