- Engagement
Engagement
RingsStyleMetalNeed something quick? - Wedding
Wedding
Rings - Eternity
Eternity
Rings - Gemstone
Gemstone
RingsGemstoneMetalNeed something quick? - Jewellery
Diamond
JewelleryTypeMetalNeed something quick? -
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 & manufacture of diamond jewellery and we have been in the industry for over 40 years.
All our jewellery is designed and created in-house at our workshop / studio in London by the Purely Diamonds team. If you have any questions, please do not hesitate to contact us.
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Help & Info
Help & Information
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.
How to...Visit our help centreTell me more about...Learn more about diamonds - Ready to ship items
Carat of a diamond

Carat is a measurement of weight for diamonds, not size as is sometimes mistakenly believed. Carat weight affects the price of a diamond more than any other of the 4 C’s. The greater the weight of the diamond the greater its value.
One carat is the equivalent of 0.2grams. Carat is measured in cts or points. A carat is divided up into 100 points. Therefore a diamond that is 0.5cts is equivalent to 50 points.
Diamond Carat
Weight Scale

While the diamonds shown above are not actual size, the increase in proportion between each is to scale.
As you can see, a 1.00ct stone is not twice the size of a 0.50ct stone.
A diamond that is twice the size of another can be as much as 4 times the price. Larger diamonds are discovered less often than smaller diamonds, which means large diamonds are more rare and therefore have greater value.
We’ve prepared some tips below to help choose which carat diamond to purchase. These tips cover budget, weight/quality of diamond and the finger size of whom will be wearing the diamond.

Tip 1 - Your budget
Decide your budget based on how much you are comfortable with spending. It's not true that you must spend 2-3 months salary, as is often recommended. According to some surveys the average engagement ring spend is around £1,500.
We are always happy to help guide you with ways you can maximise your budget. Deciding your budget will make picking a diamond much easier and you’ll be pleasantly surprised how far your budget goes with us.
Contact us to discuss budgets & options or explore our finance/interest free options.

Tip 2 - Carat Weight vs Quality
If your partner prefers larger items of jewellery, and you are working with a budget, you can purchase a larger diamond that is graded slightly lower in terms of clarity and colour.
For example, a 0.50ct D VVS1 will be more expensive than a 0.70ct G SI1, even though the 0.50ct is smaller. Opt for the 0.70ct if you think your partner would prefer a larger carat weight over colour and clarity.

Tip 3 - Finger size
Slender fingers make smaller diamonds appear larger.
A 1.00ct diamond will seem proportionately large if worn by someone with very slim fingers.
And lastly, a little something to remember... do not confuse 'carat weight' with 'carat/karat' which is the method of determining the purity of gold (e.g. 18ct white gold, 18ct yellow gold).
Purely Diamonds is a trading name of Stephen Tyler Limited. Registered Company Number (Incorporated in England): 01840310. VAT Number: 466237727 (GB)