Necklace length is the full loop of the chain, not how far it hangs down. Eighteen inches sits at the collarbone and is the standard answer — but the neckline you wear it with shifts the right choice more than your build does.
Here is where each length actually lands, how to measure your own neck, and the one adjustment almost every chart leaves out.
Necklace Length Chart
These placements are Brilliant Earth's published guide, and they assume an average adult frame worn over bare skin.
| Length | Where it falls | Also called |
|---|---|---|
| 14 in | "Sits tightly against the base of the neck" | Choker |
| 16 in | "Rests at the base of the throat/collarbone" | Collar / short |
| 18 in | "Sits at the collarbone — the most common length" | Princess |
| 20 in | "Falls just below the collarbone" | — |
| 22 in | "Rests between the collarbone and bust" | Matinee |
| 24 in | "Falls at the top of the bust" | — |
| 30 in | "Rests at mid-chest/sternum" | Opera |
| 36 in | "Falls below the bust, can be doubled" | Rope |
Two things to read out of that table. First, the useful range is narrow — 16, 18 and 20 inches cover most of what people actually wear, and the differences between them are only two inches each. Second, 18 inches is the default for a reason: it lands at the collarbone, which is where a pendant reads as jewellery rather than as a statement.
Measure Your Own Neck in Thirty Seconds
Charts assume an average neck. Yours might not be, and the fix takes half a minute.
- Wrap a soft tape measure around your neck at the height you want the necklace to sit — not at the narrowest point, at the point you actually want it.
- Read the measurement.
- Add one to two inches. Brilliant Earth's guidance is to add "1-2 inches (2.5-5 cm) to allow for movement and the weight of any pendant."
That last step is the one people skip, and it is why a necklace ordered to an exact neck measurement sits higher and tighter than expected. A pendant pulls the chain down at the front and up at the back; the extra inch is what absorbs that.
No tape measure? A strip of paper and a ruler works the same way, and a shoelace held against a ruler works if the lace doesn't stretch.
Matching Length to Neckline
This is where the chart stops being enough. The same 18-inch chain reads as elegant on a V-neck and disappears entirely under a turtleneck.
| Neckline | Length that works |
|---|---|
| V-neck | 18 in — follows the line of the opening |
| Crew neck | 16 in, or 30 in and over |
| Boat neck | 14–16 in choker styles |
| Off-shoulder | 14 in collar length |
| Strapless | 18–24 in |
| Turtleneck | 30–36 in |
The pattern is simple once you see it: a necklace either sits above the neckline or well below it, never on it. Crew necks are the trap — an 18 or 20-inch chain lands exactly on the fabric edge, which is the one place it cannot be seen properly.
What the Chart Doesn't Account For
Three things move the answer, and none of them appear on a length chart.
The pendant's own drop. Length is measured as the chain loop; a pendant hangs below that. A 20mm pendant on an 18-inch chain reads closer to a 19-inch necklace. If you are buying a chain for a pendant you already own, measure the pendant and subtract that from the length you want it to land at.
Layering. Stacked necklaces need at least two inches between them to read as separate pieces rather than a tangle — which is why 16 / 18 / 20 is the standard three-piece stack. Anything closer than two inches and they cross over each other through the day.
What you're wearing it over. The chart assumes bare skin. Over a jumper, a necklace sits noticeably further out and therefore higher, which can take a full length off the apparent drop.
Buying It as a Gift Without Asking
Most necklaces are bought for someone else, which rules out measuring them. Three ways round it, in order of reliability.
- Measure a necklace they already wear. Lay it flat, closed, and measure the full loop — not half of it. This is the only method that gives you a real answer.
- Look at where their usual necklace sits in photographs. At the base of the throat is around 16 inches; on the collarbone is around 18.
- Buy adjustable. A 16–18 inch chain with an extender removes the guess entirely and is not a lesser gift.
If you are choosing blind and none of those are available, 18 inches is the safest single number — it is the most commonly worn length and the one most people already own something at.
Which Length to Buy
| If this is you… | Buy | Why |
|---|---|---|
| First fine necklace, want it to go with everything | 18 in | Lands at the collarbone, works with the widest range of necklines |
| Buying for someone else and unsure | 18 in, or an adjustable chain | Adjustable chains with an extender solve the guessing problem entirely |
| You want the pendant visible above clothing | 16 in | Sits above most necklines rather than on them |
| Larger neck or broader frame | 20 in for the collarbone look | Charts assume an average neck; measure yours and add 1–2 in |
| You wear high necklines and jumpers | 30 in+ | Long enough to sit clearly on the fabric rather than fighting it |
| You want to layer | 16 / 18 / 20 together | Two inches apart is the minimum spacing that stays separate |
| Heavy or large pendant | Go one length up | The pendant's own drop adds to the chain's |
If you genuinely cannot decide, an adjustable chain is not a cop-out — a 16–18 inch adjustable covers the two most useful lengths, and you can settle the question by wearing it.
Every Oglowa necklace listing states the chain length and, where there is a pendant, its dimensions — because those two numbers together are what decide where it actually lands.
FAQ
What is the most common necklace length?
18 inches. It sits at the collarbone and is the standard length for a pendant necklace, which is why most chains are sold at it by default.
How is necklace length measured?
As the total length of the chain loop including the clasp — not the drop from the back of your neck to the pendant. A 20-inch necklace is a 20-inch circle of chain.
What length necklace should I buy for a pendant?
18 inches for most people and most pendants. If the pendant is large, go up a length — the pendant's own drop adds to where the chain lands.
How do I measure my own necklace length?
Wrap a soft tape around your neck at the height you want the necklace to sit, then add 1–2 inches for movement and pendant weight.
What is the difference between 16 and 18 inches?
Two inches, which in practice is the difference between sitting at the base of the throat and sitting at the collarbone. On most people that is the difference between a necklace that shows above a crew neck and one that lands on it.
What lengths should I layer?
16 / 18 / 20 is the standard set. Keep at least two inches between layers or they cross over each other as you move.
Does necklace length work the same for men?
The measuring method is identical, but the common lengths run longer — 20 to 24 inches for a chain worn under or over a collar.
Keep Reading
- Moissanite Necklace Buying Guide: What to Know Before You Buy
- Moissanite Pendant: 5 Styles and How to Choose Between Them
- How to Store Moissanite Jewelry to Keep It Looking New
Know your length? Browse the Oglowa moissanite necklace collection — chain length and pendant dimensions listed on every product page.
