Necklace Length Guide and Size Chart

Necklace guide

Necklace lengths run from 14" (choker, sits at the base of the neck) to 36"+ (rope, falls below the chest). Every necklace in Carat Theory's current necklace collection is adjustable from 16 to 18 inches, with adjustment loops around 16", 17", and before the 18" mark.

Necklace Length Chart

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Common necklace lengths, in inches and centimetres.
Length (in)	Length (cm)	Common name	Sits at	Best for
16-18 (adjustable)	40-45	Carat Theory's current necklace collection	Collarbone to just below	Everyday wear and gifting, no sizing guesswork
14	35	Choker	Base of the neck	Open necklines, layering
16	40	Princess	On or just below the collarbone	Worn alone or as the first layer
18	45	Classic length	Slightly below the collarbone	The everyday pendant length
20	50	Matinee	Upper chest	Layering, more open necklines
22	55	Mid length	Across the chest	Longer pendant pieces
24	60	Short opera	Below the chest	Statement pieces, third layer
30	75	Opera	Toward the sternum	Wrap or knot styles
36	90	Rope	Below the chest	Long layered looks, lariat styles

This chart is educational and covers standard industry lengths. The highlighted row describes what Carat Theory actually offers today.

Necklace length chart showing common lengths from 14 to 36 inches, with Carat Theory's current adjustable 16, 17, and 18 inch range highlighted. — Common necklace lengths, with Carat Theory's current adjustable 16-18 inch range highlighted. Placement varies by neckline, pendant size, body proportions, and clasp position.

The Carat Theory Perspective: Why an Adjustable 16-18" Chain

Every necklace in Carat Theory's current necklace collection is adjustable from 16 to 18 inches, with adjustment loops around 16", 17", and before the 18" mark. That means one chain covers the three most common everyday lengths, instead of locking you into a single fixed length at checkout.

16": closer to the collarbone - good for open necklines and layering
17": balanced, everyday collarbone placement
18": slightly lower, the classic pendant length, easy for daily wear

The adjustable range itself is the actual benefit: less sizing risk when buying as a gift, and more flexibility across necklines and outfits, versus committing to one fixed length.

How to Find Your Own Necklace Length

If you already own a necklace you like the length of, lay it flat and measure clasp to clasp - that's your length, no need to add anything. Without a reference necklace, a soft measuring tape held around your neck at the point where you'd want the necklace to sit gives you an approximate length directly in inches or centimetres.

Choosing a Length by Neckline

A crew or round neckline leaves the base of the neck open, which suits a 16" or 17" without crowding the collar. A V-neck pairs well with an 18", which follows the V's line instead of cutting across it. A turtleneck works better with a longer, layered length worn outside the collar itself. An off-shoulder or scoop neckline leaves room for a 16" sitting closer to the neck.

Layering Two or Three Necklaces

To layer without the chains tangling, keep at least a 2-inch gap between each length. Carat Theory's own adjustable chain is a natural starting point for layering: wear it at 16" as the first layer, then add a second, longer piece on top.

Buying a Necklace as a Gift Without Knowing Their Length

This is exactly the problem an adjustable chain solves. Instead of guessing between 16", 17", or 18", an adjustable necklace lets the person receiving it choose their own placement once it's in their hands - which meaningfully lowers the risk of a gift feeling like the wrong size.

How a Pendant Changes the Look

A pendant adds visual drop below the point where it attaches to the chain. For a larger or heavier pendant, the piece can sit roughly 0.5 to 1 inch lower than the chain length itself - worth keeping in mind if you're comparing two pendant pieces with the same stated chain length.

Worth a lookAdjustable 16-18" chain, solid 14K white gold, and IGI documentation.The Ethereal Pendant$1,070.00 View →

Frequently Asked Questions

What is the most popular necklace length?

18 inches is the most commonly recommended default length for a single pendant worn on an adult woman.

What's the difference between a 16" and 18" necklace?

Two inches, roughly the difference between sitting on the collarbone (16") and just below it (18").

How do I find my necklace length without a tape measure?

Lay a necklace you already own flat and measure clasp to clasp - that's your length, no need to add anything.

What length should I buy as a gift if I don't know their size?

An adjustable chain solves this directly - every necklace in Carat Theory's current necklace collection is adjustable from 16 to 18 inches, so the person receiving it chooses their own placement.

Do I need extra length for a pendant?

For a larger or heavier pendant, add roughly 0.5 to 1 inch to your usual length, since the piece tends to sit a little lower than the chain's attachment point.

Are Carat Theory necklaces adjustable?

Yes. Every necklace in Carat Theory's current necklace collection is adjustable from 16 to 18 inches, with adjustment loops around 16", 17", and before the 18" mark.

Written by Sahil Meghani, Carat Theory, Carat Theory. Updated September 2026.

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