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We want you to feel completely confident when you shop with us. That’s why we offer FREE 30-day returns for refunds and 60-day exchanges across the UK and Northern Ireland.
If you’ve ordered a ring smaller than a size J or larger than a size Q, don’t worry — these are custom sizes, but we’re still happy to offer a free exchange or resizing if the fit isn’t quite right.
Changed your mind? No problem — you can cancel your order anytime before it’s been dispatched.
Just reach out to our friendly team via Live Chat, by email at customerservice@thediamondstore.com, or give us a call on 0345 084 1200 (or +44 345 084 1200 if calling from outside the UK). Please have your order number handy to help us assist you as quickly as possible.
Please note that for rings smaller than size J or larger than size Q, the width may vary slightly (up to 10%) due to the crafting process. If you need any adjustments, we’re happy to help.
If your item arrives damaged or defective, we’ll make it right — fast. We’ll either repair or replace it at no cost to you, or provide a refund once it’s been assessed by our head jeweller.
Our standard returns policy is 30 days to return, and 60 days to exchange.
We stand by the quality of our jewellery. That’s why all our pieces come with a 5-year warranty against defects in materials or craftsmanship. Every item is also fully hallmarked according to UK legislation, confirming its authenticity and origin.
Once we’ve received and inspected your returned jewellery, we’ll process your refund right away and email you to confirm. Depending on your bank or payment provider, it may take 3 to 5 working days to show up on your statement.
We’ll always refund you via the same method you used to make your purchase — whether that was credit or debit card, PayPal, Pay4Later Finance, bank transfer, or another option.
To avoid delays, make sure to include the returns label print-out with your parcel. This helps us identify your return quickly.
We’re proud to say that all our diamonds are conflict-free and fully compliant with United Nations regulations. When you buy from us, you’re choosing ethical beauty.
We’re here whenever you need us.
📧 Email us: customerservice@thediamondstore.com or returns@thediamondstore.co.uk
📞 Call us: 0345 084 1200 (UK) or +44 345 084 1200 (International)
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RING SIZES & RINGS SIZERS
WHAT IS RING SIZE?
‘Ring size’ is a measurement that refers to the inside circumference of a ring. It’s important to know your correct ring size before buying a ring, otherwise it won’t fit properly.
Different countries use different standardised systems for denoting ring size.
On the right, there’s a chart with the 3 most common ring size systems used in UK, USA and internationally. For Australian sizes simply refer to the UK sizes, which are the same.
WHY USE A RING SIZER?
Ring size is one of those things we think we’ll always remember… but never actually do!
It is very important to find out the correct ring size whether the ring is for you or another person. This measurement enables us to provide you with a perfectly fitting ring. A ring that is so small you cannot get it on – or so big it falls off – can really ruin a big moment!
OUR RING SIZER APP
Our free Ring Sizer App is accurate and easy to use!
Find out a ring size in UK, EU or USA measurements. All sizes F – Z included, from smallest to largest finger.
Simply place your loved one’s existing ring on your phone screen, then adjust the circle until it fits the inside of the ring exactly.
This app helps you keep an engagement ring or a special gift a surprise and saves you a trip to the jewellers.
CROSS CHECKING AN EXISTING RING
If you have a printer and an existing ring (or measurement) then print this PDF and use it in conjunction with our app.
DOWNLOAD RING SIZER GUIDE
What is the difference between our sustainable lab grown and conflict-free mined diamonds? Is it possible to tell them apart? We explain the differences in origin, quality and price between the two, so that you can make an informed choice.
They are exactly alike optically, physically and chemically.
The main difference is their origin:
Mined diamonds have been extracted from the Earth. They were created by Mother Nature from carbon atoms subjected to intense volcanic heat and pressure deep underground more than 3 billion years ago.
Sustainable lab grown diamonds are grown by scientists in a laboratory. They are created from a tiny shard of a mined diamond which is introduced to carbon atoms, under conditions which replicate the volcanic forces of Mother Nature.
Yes, lab grown diamonds are not extracted from the ground, which makes them environmentally sustainable and ethical as they conserve the Earth for future generations.
No. As long as you are buying mined diamonds from a reputable jeweller that abides by the Kimberley Process, your diamonds are ethical because they are conflict-free.
No, you cannot tell the difference between a lab grown diamond and a mined diamond by looking at them.
Therefore, to protect consumers, lab grown diamonds are branded with a microscopic laser mark to distinguish them from mined diamonds.
You cannot see this mark with your naked eye, but a jeweller will be able to see it with specialist magnifying equipment.
Yes, lab grown diamonds are more affordable than mined diamonds, giving you more carats for your budget.
You’ll find most of our popular jewellery ranges available in both options so you’ll be able to compare easily.
Bear in mind, however, that the precious metal setting plays a part in price. Silver is the most affordable, gold is a little more expensive, and platinum is the most expensive.
No, lab diamonds are not fake diamonds. Sometimes people confuse lab grown diamonds with simulants like cubic zirconia, which are not diamonds.
But this is not the case with lab diamonds. Gemmologists (the scientists who study diamonds and gemstones) classify lab diamonds, simply, as diamonds.
Learn more about the identical characteristics of lab diamonds here.
Mined diamonds and lab diamonds are quality-graded by gemmologists in exactly the same way using the Four Cs – Cut, Colour, Clarity and Carat weight.
Therefore, your diamond (regardless of whether it is lab grown or mined) will simply be graded at the quality it has, for example, Premium Quality, H/Si or E/Vs.
Having said that, since lab diamonds are more affordable than mined diamonds per carat, you’ll usually be able to access a much better diamond grade/quality for your budget if you choose lab grown.
“Better” is very subjective. It’s like cars. If someone asks you if an Aston Martin or a Ferrari is better, your answer would depend on your individual requirements.
It is the same with lab grown diamonds and mined diamonds.
Conflict-free mined diamonds are simply beautiful to look at and last a lifetime. A rare luxury created by Mother Nature, they come with the legacy of having been sourced from the Earth.
Sustainable lab grown diamonds are also stunning to gaze at, and they also last a lifetime. More affordable than mined diamonds, they are additionally sustainable and ethical.
In conclusion, both lab grown diamonds and mined diamonds are luxurious, beautiful and sparkling options – and they will both make wonderful gifts for a lifetime. Now, you simply have more choice.
If you have any questions, we’re always happy to chat. Just email us on sales@thediamondstore.co.uk.
High quality grades of diamonds.
Because we only sell 5 different grades of diamonds, all of which are of a high quality, the diamond you have already chosen won’t have any obvious flaws. But if your priority is for your diamond to have the best possible quality and sparkle, then investing in the next grade up makes good sense.
What would be the difference if you moved up a grade? Your diamond will look more radiant, gain in value – and you’ll get the very best quality for your budget.
Upgrading the size of your diamond means increasing its carat weight
The more carats a diamond weighs, the bigger it is.
The larger the diamond is, the rarer it is to find. That’s why an increase in size is a larger investment. When considering the size, think about what she or your friends wear and how you would like to compare.
Below you can see the different diamond sizes we sell. If you’d like a real sense of scale, follow this link for “real size” printable images of our diamonds: Real size diamond measurements.
| Round Brilliant Cut Diamonds | Diameter mm |
|---|---|
| 0.10ct | 3.00mm |
| 0.20ct | 3.80mm |
| 0.25ct | 4.00mm |
| 0.30ct | 4.20mm |
| 0.40ct | 4.80mm |
| 0.50ct | 5.00mm |
| 0.70ct | 5.75mm |
| 1.00ct | 6.50mm |
| Square Princess Cut Diamonds | Width mm |
|---|---|
| 0.10ct | 2.50mm |
| 0.20ct | 3.20mm |
| 0.25ct | 3.40mm |
| 0.30ct | 3.60mm |
| 0.40ct | 4.00mm |
| 0.50ct | 4.40mm |
| 0.70ct | 4.80mm |
| 1.00ct | 5.50mm |
| Emerald Cut Diamonds | Length & Width |
|---|---|
| 0.25ct | 4mm x 3mm |
| 0.33ct | 5mm x 3mm |
| 0.50ct | 8mm x 4mm |
| 1.00ct | 10mm x 5mm |
| Pear Shape Diamonds | Length & Width |
|---|---|
| 0.30ct | 5mm x 3mm |
| 0.50ct | 6mm x 4mm |
| 1.00ct | 8mm x 5mm |
| Marquise Diamonds | Length & Width |
|---|---|
| 0.25ct | 5mm x 3mm |
| 0.50ct | 8mm x 4mm |
| 0.75ct | 9mm x 4.5mm |
| 1.00ct | 10mm x 5mm |
White gold or platinum?
The main advantage of white gold over platinum is that it’s much more affordable. However, the disadvantage of white gold is that you may need to recoat your jewellery in rhodium once or twice a year. This adds to its overall cost over time, whereas platinum, more expensive to start with, will never require any maintenance.
If you’d like to read more about how white gold and platinum compare, follow this link: White Gold Vs Platinum.