Ring sizing is a critical aspect of jewellery making that ensures the final product fits perfectly and feels comfortable. Whether you’re creating a ring for yourself, a customer or as a gift, getting the size right is essential. This guide will cover everything you need to know about ring sizing, from understanding the basics to measuring accurately and making adjustments.
Why Is Ring Sizing Important?
A poorly sized ring can be uncomfortable and impractical. Rings that are too tight may cause discomfort or restrict blood flow, while rings that are too loose risk being lost. For jewellery makers, accurate sizing demonstrates professionalism and ensures customer satisfaction.
Understanding Ring Sizes
Ring sizes are typically measured in numerical or alphabetical systems, depending on the region. The most common sizing systems include:
- UK Sizing: Uses letters (e.g., L, M, N).
- US Sizing: Uses numbers (e.g., 6, 7, 8).
- European Sizing: Measures the inside circumference of the ring in millimetres.
Below is a basic ring sizing chart to help you understand the conversion between different systems:
UK Size | European Size (mm) | Inside Diameter (mm) |
J | 48 | 15.27 |
K | 50 | 15.88 |
L | 51.5 | 16.45 |
M | 52.5 | 16.85 |
N | 54 | 17.35 |
O | 55 | 17.75 |
P | 56 | 18.15 |
Q | 57 | 18.55 |
R | 58.5 | 19.10 |
S | 60 | 19.51 |
T | 61 | 19.84 |
U | 62.5 | 20.20 |
V | 63.5 | 20.68 |
Facts About Ring Sizing
- The average ring size for women is UK size M or US size 6, while the average for men is UK size T or US size 10.
- Fingers on the dominant hand are often slightly larger than those on the non-dominant hand.
- Pregnancy, diet and weather can all temporarily affect finger size.
Tools for Measuring Ring Sizes
To ensure accuracy, use reliable tools for measuring:
- Ring Sizer Set (1VP 013): A set of metal or plastic rings in various sizes to try on.
- Ring Triblet (997 3601): A tapered tool marked with size measurements to determine the size of an existing ring.
- Finger Gauge (999 AIA): A series of adjustable rings to measure the finger directly.

Tips for Accurate Measurements
- Measure the finger at room temperature, as fingers expand in heat and shrink in cold.
- Consider the width of the ring; wider bands may require a slightly larger size for comfort.
- Measure at different times of the day, as fingers can swell due to activity or hydration levels.
- If the size falls between two options, opt for the larger size to ensure comfort.

Adjusting Ring Sizes
Sometimes adjustments are needed after the ring is made. Here are common methods:
- Resizing Smaller: This involves removing a small section of the band and soldering it back together.
- Resizing Larger: Can be achieved by stretching the ring using a triblet or adding a piece of metal to the band.
- Using Sizing Beads: Small metal beads are added to the inside of the band to make the ring fit more snugly.
- Ring Guards: Temporary adjustments using plastic or metal guards for non-permanent solutions.
Challenges and Considerations
- Material Matters: Some metals, like titanium and tungsten, are challenging or impossible to resize.
- Gemstone Placement: Rings with stones set around the entire band may require special techniques.
- Customer Preferences: Always consider the wearer’s comfort and preferences when resizing.
Frequently Asked Questions About Ring Sizing
1. Can I measure my ring size at home?
Yes, you can use a printable ring size chart or a piece of string and a ruler, but visiting a jeweller ensures the most accurate measurement.
2. How do I know if my ring fits properly?
A properly fitting ring should slide over the knuckle with slight resistance and sit snugly on the finger without pinching.
3. Can all rings be resized?
No, rings made from materials like titanium, tungsten or ceramic are difficult or impossible to resize.
4. What should I do if my finger size changes over time?
Visit a jeweller to have your ring resized. Temporary solutions like ring guards can also help.
5. How much does ring resizing cost?
The cost varies depending on the complexity, material and whether the size is being increased or decreased.
Providing Ring Sizing Guidance for Customers
As a jewellery maker, offering guidance to your customers on ring sizing can enhance their experience. Consider providing:
- Free sizing consultations.
- Educational materials about ring sizing.
- Policies for resizing in case of errors.
Ring sizing might seem like a small detail, but it’s one of the most crucial elements of making a ring. By understanding the sizing systems, using accurate tools and knowing how to make adjustments, you can ensure every ring you make is a perfect fit.

Sian Brown
Sian has been hand making her award winning jewellery in the West Midlands for over 12 years. Sian spent 10 years in Birmingham’s historic Jewellery Quarter before relocating to a quiet Worcestershire village.