Necklace Length Guide:

A 40 cm chain is about 15.7 inches long. On many people, it sits close to the base of the neck or around the upper collarbone. It can work well when you want a shorter necklace or when you plan to wear it above a longer pendant.

The fit will feel closer on someone with a larger neck measurement, and may sit lower on someone with a smaller neck. Check the neckline too: a 40 cm chain may be visible above some crew necks but can sit inside a high neckline.

If you are buying a shorter necklace to layer, compare it with the length of the other chain. The two pendants should have enough space between them to stay visually distinct.

A 45 cm chain is approximately 17.7 inches long. It often rests around the collarbone, which is why it is a common length for everyday necklaces. It can work with shirts, blouses, open collars and many V-neck tops, although the pendant’s shape affects where the bottom of the necklace falls.

A 45 cm chain is not exactly the same as an 18-inch chain. Eighteen inches converts to approximately 45.7 cm. For example, the Aurora Y Necklace lists an 18-inch chain. Look for the measurement stated on the product page rather than assuming a listed length has been rounded.

A 50 cm chain is about 19.7 inches long. It generally sits below the collarbone and may bring the pendant lower onto the upper chest. It can suit a higher neckline or create a longer position beneath a shorter necklace.

The final position depends on your proportions and the pendant. A larger pendant can hang lower than a small solitaire on the same chain. If you want to layer a 50 cm chain with a shorter necklace, compare where both pendants end so they do not sit on top of each other.

Choose between 40 cm and 45 cm by deciding whether you prefer a close-fitting chain or a pendant that sits nearer the collarbone.

• Choose 40 cm if you want a shorter look or need a chain to sit above another necklace.
• Choose 45 cm if you want a length that often works with everyday tops and open necklines.
• Check your own fit by measuring around your neck where you want the chain to rest.

If you already have a necklace that fits well, measure it and use that as your reference. Check how it was measured: some product listings provide the full chain length, while others may describe the length differently.

A 45 cm chain often sits around the collarbone, while a 50 cm chain generally hangs lower. Choose 45 cm if you want a pendant closer to the neckline. Choose 50 cm if you prefer more space below the collarbone or want to place the necklace beneath a shorter layer.

A difference of 5 cm may look small on paper, but it can change where the pendant sits against a top. If you are choosing a necklace for a particular outfit, measure from the clasp position to the point where you want the pendant to end.

You can estimate your preferred necklace length with a flexible tape measure or a piece of string:

1. Place the tape or string around your neck at the position where you want the chain to sit.
2. Adjust it until it feels comfortable—not tight.
3. Note the measurement where the ends meet.
4. If you use string, lay it flat beside a ruler and measure it in centimetres.
5. Compare that measurement with the chain length shown on the product page.

If you are measuring an existing necklace, lay it flat and measure it from end to end with the clasp closed. Use the same method for the necklace you are considering, where the product page provides enough information to compare them.

Remember that the pendant adds length below the point where the chain rests. Check the pendant’s height as well as the chain measurement when you want to predict where the bottom of the design will fall.

The necklace should sit in a clear space around the neckline. A chain can be the right length by measurement but still be partly hidden by a collar or sit awkwardly against a V-neck.

These are starting points rather than strict rules. The garment’s neckline, fabric and pendant shape all affect how the necklace looks.

Selected I Want Jewels product pages show an 18-inch chain, which is approximately 45.7 cm. The Aurora Y Necklace is one example. The Renata Necklace also lists an 18-inch chain.

The lengths 40 cm, 45 cm and 50 cm in this guide are comparison points to help you understand common necklace measurements. Do not assume a specific product is available in all three lengths. Check the individual product page for its listed chain measurement and any available options.

Browse the I Want Jewels necklace collection to compare designs. Product measurements and availability may change, so confirm the details on the product page before ordering.

If you are buying a necklace for someone else, look at the length of the chains she already wears. A photo may give you an idea of where her pendant sits, but it cannot confirm the exact measurement.

If you cannot check her preferred length, choose a design with the chain measurement clearly stated and consider whether it is likely to work with the necklines she wears. Also check the pendant dimensions, available finish and the current product details.

For broader present ideas, see the jewellery gift guide.

A 40 cm chain usually gives a closer fit, 45 cm often sits around the collarbone, and 50 cm generally falls lower on the upper chest. Measure a necklace that already fits the way you like, then compare it with the exact chain length listed for the design.

Explore the I Want Jewels necklace collection and check each product page for its chain measurement, pendant dimensions and available options.