- About us
We are Purely Diamonds
A British family run diamond jewellery design studio based near Hatton Garden, London. We are specialists in the design and manufacture of diamond jewellery.
We have over 40 years heritage, during which time we've built up hard to rival expertise in sourcing exceptional diamonds, and creating beautiful diamond jewellery.
All our jewellery is designed and created in-house at our workshop / studio in London by the Purely Diamonds team.
Please get in touch if you have any questions or would like to discuss a bespoke design idea.
Family run with over
40 years heritageWe design &
manufacture in-houseLondon showrooms
in Farringdon & Clerkenwell - Reviews
Buyer reviews and feedback
Our customers love our products and our personal service. We're proud to say that we have a great rating on Trust Pilot thanks to our very happy customers.
Wonderful!!
I cannot recommend this company enough. They really care for their customers and will do everything to meet your needs. I would not hesitate to use them again and/or recommend them to my friends and family. Thank you Stephanie. :) x
3 days ago by Lyndzy Taylor
- Help & Resizing
Help & Resizing
When shopping online, most customers have a few questions. We've collated the most popular questions and information that we've been asked over the years with the goal to streamline your buying experience with us.
We also offer you the ability to visit us and view the rings in person. You can book a visit to our London showroom.
If you can't find the answer you're looking for, please get in touch.
Frequently asked questionsView in personAfter sales information - Contact us
Contacting us
If you have a query about a product or an order, or just a general enquiry, then please get in touch. Our customer support staff will be happy to answer your questions.
TELEPHONE
0800 032 3422 or 0207 837 2964Visit our London showroomMake an appointment to visit the Purely Diamonds showroom where you can see and try on our diamond jewellery designs for yourself.
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Engagement
RingsStyleMetalNeed something quick? - Diamond Rings
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RingsStyleNeed something quick? - Eternity
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RingsStyleNeed something quick? - Gemstone
Gemstone
RingsGemstoneMetalNeed something quick? - Earrings & Pendants
Earrings, Pendants &
BraceletsTypeMetalNeed something quick? - Ready to ship items
- Home
- Help centre & Information
- Ring Size
- What should I do if I don't know the ring size?
What should I do if I don't know the ring size?

We have a few ways to help you find out the ring size
If you do purchase the wrong ring size, don't panic! You can return your ring to us so that we can resize it as needed. View our resizing page for sending your item to us for resizing.
If you do have access to the ring finger or another ring...
If the recipient owns any other rings, see if you can find one and use our Online Tool to find out the size. If you don't want to use the tool, try to measure the internal diameter of the ring using a ruler or other measuring device. Once you have the diameter use our Ring Size Chart to convert the millimetre size in to a UK ring size. Please be sure to measure only the inside diameter, NOT including the band/metal itself as this will give you a size far larger than you require. Measuring internal diameter needs to be pretty precise as a difference of a few tenths of a millimetre is equivalent to one whole size.
Be aware that any ring you find to measure might be worn on a finger that is smaller or larger than the finger you intend them to wear it on. If the ring you measure is worn on the middle finger, we recommend approx 2 sizes smaller for their ring finger.
If you can measure the finger of the recipient, or the ring is for yourself, visit our Free Ring Sizer ordering page to request a measuring tape to be sent to you.
If the ring is a surprise and you don't have another ring to measure, see other options below.
If you don’t have access to the ring finger or any other ring...
Getting the right ring size can be tricky if the ring is a surprise. Most people will have other rings they wear or have worn at some point, so try to find one that you can measure! (See options above if you find one).
If you really don't know the size and have no way of borrowing a ring of theirs, please select either Small, Average or Large. As a guide, these sizes will be approx. size J/K for small, size M/N for average and size P/Q for large. Once you have presented the ring, if it doesn't fit, all you have to do is send it back to us and we'll resize it to the correct size and send it back within 5 working days. There is a small charge for this service (£20).
The sizing process is usually very straight-forward and generally we can return the ring within 3-5 working days. Some items will take longer, or may have to be remade, if this is the case you will be notified as soon as we receive your ring back.
The quality of your ring will not be affected by re-sizing.
Please see our Returns page for more details and please read our Terms & Conditions before returning items to us.
Download our printable Ring Size Conversion Chart (102kb PDF)
United Kingdom, Ireland, and Australia | United States and Canada | Inside diameter (mm) | European Size, Inside Circumference (mm) | China, Japan | Switzerland |
---|---|---|---|---|---|
- | 0000 | 9.91 | 31.13 | - | - |
- | 00 | 10.72 | 33.68 | - | - |
- | 0 | 11.53 | 36.22 | - | - |
A | 1/2 | 11.95 | 37.54 | - | - |
A 1/2 | 3/4 | 12.18 | 38.26 | - | - |
B | 1 | 12.37 | 38.86 | 1 | - |
B 1/2 | 1 1/4 | 12.60 | 39.58 | - | - |
C | 1 1/2 | 12.78 | 40.15 | - | - |
C 1/2 | 1 3/4 | 13.00 | 40.84 | - | - |
D | 2 | 13.21 | 41.50 | 2 | 1 1/2 |
D 1/2 | 2 1/4 | 13.41 | 42.13 | - | - |
E | 2 1/2 | 13.61 | 42.76 | 3 | 2 3/4 |
E 1/2 | 2 3/4 | 13.83 | 43.45 | - | - |
F | 3 | 14.05 | 44.14 | 4 | 4 |
F 1/2 | 3 1/8 | 14.15 | 44.45 | - | - |
G | 3 3/8 | 14.36 | 45.11 | 5 | 5 1/4 |
G 1/2 | 3 5/8 | 14.56 | 45.74 | 6 | - |
H | 3 3/4 | 14.65 | 46.10 | - | 6 1/2 |
H 1/2 | 4 | 14.86 | 46.68 | 7 | - |
I | 4 1/4 | 15.04 | 47.40 | - | 7 3/4 |
I 1/2 | 4 1/2 | 15.27 | 48.00 | 8 | - |
J | 4 5/8 | 15.40 | 48.70 | - | 9 |
J 1/2 | 5 | 15.70 | 49.30 | 9 | - |
K | 5 1/8 | 15.80 | 50.00 | - | 10 |
K 1/2 | 5 3/8 | 16.00 | 50.60 | 10 | - |
L | 5 1/2 | 16.10 | 51.20 | - | 11 3/4 |
L 1/2 | 5 7/8 | 16.41 | 51.85 | - | - |
M | 6 | 16.51 | 52.50 | 12 | 12 3/4 |
M 1/2 | 6 1/4 | 16.71 | 53.10 | - | - |
N | 6 1/2 | 16.92 | 53.80 | 13 | 14 |
N 1/2 | 6 3/4 | 17.13 | 54.40 | - | - |
O | 7 | 17.35 | 55.00 | 14 | 15 1/4 |
O 1/2 | 7 1/4 | 17.45 | 55.70 | - | - |
P | 7 1/2 | 17.75 | 56.20 | 15 | 16 1/2 |
P 1/2 | 7 3/4 | 17.97 | 56.80 | - | - |
Q | 8 | 18.19 | 57.40 | 16 | 17 3/4 |
Q 1/2 | 8 1/4 | 18.35 | 58.00 | - | - |
R | 8 5/8 | 18.61 | 58.90 | - | 19 |
R 1/2 | 8 7/8 | 18.80 | 59.40 | - | - |
S | 9 1/8 | 19.10 | 60.00 | - | 20 1/4 |
S 1/2 | 9 3/8 | 19.31 | 60.66 | - | - |
T | 9 5/8 | 19.51 | 61.29 | - | 21 1/2 |
T 1/2 | 10 | 19.84 | 62.33 | 20 | - |
U | 10 1/4 | 20.02 | 62.89 | 21 | 22 3/4 |
U 1/2 | 10 1/2 | 20.20 | 63.46 | 22 | - |
V | 10 5/8 | 20.32 | 63.84 | - | 23 3/4 |
V 1/2 | 11 | 20.68 | 64.97 | 23 | - |
W | 11 1/8 | 20.76 | 65.22 | - | 25 |
W 1/2 | 11 3/8 | 20.94 | 65.78 | - | - |
X | 11 5/8 | 21.18 | 66.54 | - | 26 1/4 |
X 1/2 | 11 7/8 | 21.30 | 66.92 | - | - |
Y | 12 | 21.49 | 67.51 | 25 | 27 1/2 |
Y 1/2 | 12 1/4 | 21.69 | 68.14 | - | - |
Z | 12 1/2 | 21.89 | 68.77 | 26 | 28 3/4 |
Z +1/2 | 12 3/4 | 22.10 | 69.43 | - | - |
Z+1 | 13 | 22.33 | 70.15 | 27 | - |
Z+1.5 | 13.5 | 22.60 | 71.00 | - | - |
Z+2 | - | 22.69 | 71.28 | - | - |
Z+2.5 | - | 22.92 | 72.00 | - | - |
Z+3 | - | 23.06 | 72.45 | - | - |
Z+3.5 | - | 23.24 | 73.01 | - | - |
Z+4 | - | 23.47 | 73.73 | - | - |
Z+4.5 | - | 23.55 | 73.98 | - | - |
Z+5 | - | 23.87 | 74.99 | - | - |
Z+6 | - | 24.27 | 76.25 | - | - |
CONFLICT-FREE SOURCED DIAMONDS
FAMILY-RUN BUSINESS & 40 YEARS HERITAGE
30 DAY MONEY-BACK GUARANTEE
Purely Diamonds is a trading name of Stephen Tyler Limited. Registered Company Number (Incorporated in England): 01840310. VAT Number: 466237727 (GB)