Close up of woman wearing a round brilliant solitaire engagement ring in yellow gold stacked with a yellow gold beaded band. The models white lacy top and brown hair can be seen in background.

Collection: Round Brilliant Cut Engagement Rings

Impeccably crafted for maximum sparkle, each engagement ring showcases the timeless beauty and precision of the round brilliant cut. Discover perfect ethical luxury in this collection that is meticulously set with the finest grade D-F VVS lab grown diamonds or premium grade VVS1 D-E moissanite.
Both options come with full certification reports.


The highest price is £22,660.00 Reset
0 selected Reset

Showing 152 results

Sort by
Filter & Sort

Filter & Sort


The highest price is £22,660.00


Showing 152 results

Round Shape Diamond Engagement Rings

The most radiant diamond shape of them all, the round brilliant cut is a timeless classic, that will always be the most desired and classic cut for engagement rings. The Round Brilliant cut diamond is loved for its unmatched brilliance and beauty, and it returns the most amount of light due to its ideal facet pattern, resembling a simple circle, which makes it extremely versatile.

During the Edwardian, Victorian and Art Deco era’s, the round shaped diamond cut was known as the Old European cut; it wasn’t until 1919 that the Round Brilliant cut was invented by Marcel Tolkowsky and from there, the brilliance of the Round Brilliant cut has been refined more and more.

The Round Brilliant cut diamond is by far the most popular and most researched stone cut available today, making up for over two thirds of all diamonds sold. For almost 100 years, diamond cutters have been using advanced theories of light behaviour and precise mathematical calculations to optimise the fire and brilliance of the Round Brilliant cut. The crème de le crème cut for this beloved shape is known as Hearts and Arrows, which is our standard cut grade for the Ethica Diamond, and also known as "Ideal".

The Round Brilliant cut is the most expensive cut, not only due to their popularity but because they have more facets than any other cut, which requires more precision work. Cutters also have to discard more of the rough diamond, so you pay for a bigger diamond than you end up with. At Ethica, we are very happy to take a look at the cut quality of the Round Brilliant cut diamond and advise you accordingly; just get in touch and we will be happy to help.

This collection of rings are meticulously crafted by hand to the highest standards, offering exquisite quality and sparkle. We offer a choice of both lab grown diamonds that come with a full diamond grading report from the IGI, GIA or GCAL or our signature gemstone, the Ethica Diamond

The Ethica Diamond is precisely cut from super premium grade moissanite with a diamond infusion and independently certified by the GRI. Furthermore, all Round Brilliant Ethica Diamonds are consistently cut by hand to the coveted ‘Hearts and Arrows’ cut, the best you can get for sparkle and light play.

Frequently Asked Questions

What do I look for when choosing a round brilliant diamond?

When choosing a round brilliant diamond, there are several factors to consider to ensure you get the best quality stone:

1. Cut: The cut of a round brilliant diamond is crucial as it determines the stone's brilliance and sparkle. Look for diamonds that have an Excellent or Very Good cut grade, as these will have optimal light performance.

2. Colour: The colour of the diamond will affect its overall appearance. The GIA grades diamond colour on a scale from D (colourless) to Z (light yellow or brown). Aim for a diamond in the near-colourless range, such as G or higher, as these will appear white to the naked eye and offer good value.

3. Clarity: Clarity refers to the presence of any internal or external flaws in the diamond. Look for diamonds with a clarity grade of VVS or higher, as they are typically eye-clean (meaning no visible flaws).

4. Carat weight: Consider your desired carat weight based on your budget and personal preferences. Remember that a well-cut diamond will appear larger than a deeper or poorly-cut stone of the same carat weight.

5. Certification: Always choose a diamond that has been independently certified by a reputable grading organisation like GIA or IGI. This ensures that you are getting an accurate and unbiased assessment of the diamond's quality.

6. Budget: Determine your budget before starting your search so you can prioritise the characteristics that matter most to you. Remember that a balance between the 4Cs (cut, colour, clarity, and carat weight) is important to get the most visually appealing diamond within your budget.

Is a round brilliant cut the best cut for an engagement ring?

The round brilliant cut is often considered the best cut for an engagement ring due to its exceptional brilliance and fire. The cut of a diamond refers to how well it has been shaped and faceted, impacting its ability to reflect and refract light.  The Round Brilliant diamond is a classic and timeless choice for a diamond. It has been favoured for centuries and has stood the test of time in terms of popularity. The round brilliant cut is incredibly versatile and complements all styles of engagement ring settings.

Does a round brilliant diamond have the most sparkle?

The round brilliant cut diamond is often considered to have the most sparkle among the different diamond cuts. Its 58 precisely angled facets allow it to maximise light performance and create a high level of brilliance and fire. The round shape also helps to achieve optimal light reflection and refraction, resulting in a dazzling display of sparkle from all angles. However, it's worth noting that other diamond cuts, such as the princess cut or cushion cut, can also exhibit excellent sparkle depending on their specific cut quality and proportions. Ultimately, the amount of sparkle a diamond exhibit