Summer Sale Now On ends in

Price match guarantee. Found a better price? We’ll beat it.*

_ ×
Book An Appointment

Select Location
London

Diamonds Factory
7 Hatton Garden
London
EC1N 8AD
Birmingham

Diamonds Factory
Shop 12 - The Big Peg
Access via Warstone Lane
Birmingham
B18 6NF
Liverpool

Please visit our partners 'Austen & Blake'
Jewellers at
9, Parker Street,
Liverpool,
L1 1DJ
Leeds

Please visit our partners 'Austen & Blake'
Jewellers at
4 Commercial Street
Leeds
LS1 6AL
Manchester

Please visit our partners 'Austen & Blake'
Jewellers at
17 King Street,
Manchester,
M2 6AW
Sheffield

36 the Arcade,
Meadowhall Shopping Centre,
Sheffield,
S9 1EH
Nottingham

178,
Victoria Centre,
Victoria St,
Nottingham NG1 3QH
Glasgow

Please visit our partners 'Austen & Blake'
Jewellers at
52 Argyll Arcade,
Glasgow,
G2 8BA
Edinburgh

27 Hanover St,
Edinburgh,
EH2 2DL,
UK
Newcastle

Regus, Merchant House,
30 Cloth Market,
Newcastle Upon Tyne,
NE1 1EE
Belfast

16 Donegall Square
North Belfast
BT1 5GB
Schedule Date & Time
Please select your time slot to book your appointment.

Appointment Summary

Date:

Time:


Location:

Service:


Please complete your details and secure your booking with us

Name:*

E-Mail:*

Mobile/Landline:*

Notes & Requests

I give consent to be contacted by Diamonds Factory about my enquiry via phone or email.

Ring Size Guide &
Ring Conversion Chart

So you have found the perfect diamond ring, but how do you find your ring size? Whether you are buying an engagement ring for your partner or a wedding ring for yourself, our ring size guide UK provides the best tips on how to measure ring size at home.

Ring size conversion chart

Our UK ring size conversion chart is designed to help you find your ring size at home. Just measure the ring size circumference of the finger you will be wearing the ring on, using a tape measure. Then use the ring size conversion chart to get your ring size and convert it.

RING SIZE CIRCUMFERENCE (MM)
A 37.8
B 39.1
C 40.4
D 41.7
E 42.9
F 44.2
G 45.5
H 46.8
I 48.0
J 48.7
K 50.0
L 51.2
M 52.5
RING SIZE CIRCUMFERENCE (MM)
N 53.8
O 55.1
P 56.3
Q 57.6
R 58.9
S 60.2
T 61.4
U 62.7
V 64.0
W 65.3
X 66.6
Y 67.8
Z 68.5

How to measure your finger for a ring

The most accurate way to measure your finger for a ring is to get professionally measured in-store. However, if this isn't possible, we offer a downloadable ring sizer that enables you to measure your ring size at home. Just follow these easy steps.

  1. 1. Follow the instructions to download and print our ring size guide on A4 paper.
  2. 2. Find the ring you want to measure and place it against the circles on the guide.
  3. 3. Match the dotted circle to the inside of the ring so that it fits perfectly.
  4. 4. You then have your ring size and can order your ring.

Order a free ring sizer

Don’t have a printer? No problem. We offer a free ring sizer tool that can be delivered straight to your door.

How to measure a ring in secret

Buying an engagement ring or a surprise gift for your partner? Here are our top tips on how to find their ring size in secret.

  1. Ask a friend or family member.

    Someone close to your partner may already know their ring size or could even try and subtly ask them on your behalf.

  1. Measure an existing ring.

    If they already wear a ring on the finger in question, why not secretly measure it? You can either take the ring to a jeweller to be measured or print our ring size guide to measure it yourself.

  1. Measure their finger while they are asleep.

    Although slightly trickier, you can measure your partner's finger using a piece of string whilst they are asleep. Just wrap it around the ring finger and tie a knot. Then using the string, measure it against our ring size guide.

Searching for the perfect engagement ring?

Head to our engagement ring guide to learn everything you need to know about finding an impressive ring for the one you love.

Ready to tie the knot?

Learn about who should buy the wedding rings, the best metal for your bands and other most asked questions in our wedding rings buying guide.

Ring measuring tips and tricks

Here are our top ticks and tricks to remember when measuring ring size.

Temperature - Hot temperatures expand the skin while cold temperatures shrink the skin. So it is a good idea to consider this before measuring.

Weight loss or gain - Any weight changes will impact how loose or tight the ring will fit.

Pregnancy - Just like weight, pregnancy can impact ring size. Bear in mind that fingers will be more swollen.

Comfort - Consider how easy it is to put on your finger and allow your finger to swell or shrink depending on the temperature.

Time - The best time of day to measure ring size is in the evening as the fingers are bigger in the evening when compared to the morning.

Ring resizing options

Don’t worry if you don’t get it right the first time, as we offer a 30-day free resizing for up to two sizes up or down.

Average ring sizes

When buying an engagement ring, some people choose the average ring size and get it resized later. Here is how the average ring size UK differs for both men and women.

Average UK ring size for women

The average ring size for women ranges from size K to N, as shown on the women's ring size guide.

Average UK ring size for men

The average ring size for men ranges from size S to T, as shown on the men's ring size guide. The most popular ring size for men in the UK being size T.

Need help finding your ring size?

Our friendly Customer Service Team is available to help should you need further guidance. Head into a live chat or call us on 020 7138 3672 to speak to one of our team members.

@diamondsfactoryworld