Ring sizer – How to measure ring size


Sizing a ring is an intricate task that calls for expert dexterity. Taking a measurement of the wearer’s finger is the first step in selecting the right ring size. A digital finger sizer, a plastic ring sizer, or a metal ring sizer can all be used for this purpose.

The jeweller can establish the correct size by sliding the sizer onto the finger and adjusting it until it fits snugly. But what happens when a ring is too large or too small? This is where the true artistry of the jeweller comes into play.

What is a ring sizer?

Let us begin by discussing the various tools that are used to determine ring size. The most common tool is the metal ring sizer, which is a set of metal rings in various sizes that are used to find the appropriate size for a ring.

Another popular tool is the plastic ring sizer, which is a flexible plastic strip with pre-marked ring sizes. The plastic ring sizer is a flexible plastic strip with pre-marked ring sizes, and it is also sometimes called a “mandrel” or “finger sizer”. The digital ring sizer is a small electronic device that uses a sensor to measure the finger size.

How to use a ring sizer?

The process of using a ring sizer is straightforward, the ring sizer is placed over the finger and adjusted until it fits comfortably. This will give the jeweller the correct size for the ring. It is important to note that the finger size can fluctuate due to factors such as temperature, humidity, or time of day. Therefore, it is always recommended to measure the finger at the end of the day when it is most likely to be at its largest size. Also, it is important to measure the finger multiple times to ensure the most accurate size, especially when measuring for a custom-made engagement ring.

A plastic ring sizer is easy to use, simply place it over the finger and adjust it until it fits well. The size of a person’s finger might change depending on various conditions, therefore, it is best to take the measurement late in the day, when the finger is most pliable. It is essential to check the size of the ring periodically, especially when the ring is worn daily. As the finger size can change due to various factors such as weight loss or gain, pregnancy or due to certain medical conditions.

When measuring for a ring that will be worn on a different finger, it is important to take into consideration the width of the ring as well. The width of the ring can affect the fit, so it is important to measure the finger for both width and size.

When measuring for a ring that will be worn with other rings, it is important to measure the finger at its widest point. This will ensure that the ring will fit comfortably when worn with other rings.


The process of sizing a ring is one that calls for delicacy and accuracy. While not all rings can be sized, there are still ways to get the right fit, such as using ring sizers. Plastic ring sizers are a quick and easy tool for jewellers to determine the proper size of a ring. It is important to ensure that the finger is at its largest size and to measure the finger multiple times to ensure the most accurate size.

In addition to ring sizers, jewellers use other tools for ring sizing, such as ring mandrels, ring gauges, and ring-stretching pliers. Ring mandrels are tapered cylindrical tools used to size and shape rings. Ring gauges are a set of metal rings used to measure the internal diameter of a ring. Ring-stretching pliers are specialised pliers used to gently pull the band’s metal apart, creating more room for the finger when sizing up a ring. These tools are essential for any jeweller as they allow them to accurately determine the size of a ring and resize it if necessary.

So next time you slip a ring on your finger, take a moment to appreciate the intricate process of making it the perfect fit. And remember, the artistry and expertise of the jeweller are what make it possible.