Round Cut Lab Grown Diamonds
Discover our collection of over 13,000 certified loose lab grown round cut diamonds. Identical in brilliance, cut and clarity to natural diamonds, created sustainably in a controlled environment.
From a show-stopping solitaire to a delicate everyday pendant our lab grown diamonds give you more stone for your budget. No compromise on quality, cut or beauty.
Browse Excellent cut stones in colours D to J and clarities VVS2 and beyond. All GIA, IGI or HRD certified. Prices start from just €864.
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Book Your Lab Grown Diamond Consultation
Book Your Lab Grown Diamond Consultation
Visit our Hatton Garden showroom or book a virtual appointment to explore our full lab grown collection in person. Our diamond specialists will guide you through every carat, cut and certification, helping you find the perfect stone for your story.
Let Our Experts Help You Find the Perfect Round Cut Lab Grown Diamond
How we bring your round cut lab grown diamond to life
A lab grown round diamond is designed in the popular brilliant style, featuring 57 or 58 precisely cut facets that maximize light reflection. We source every round cut lab grown diamond from trusted growers who use advanced technology to replicate the natural diamond-forming process inside a controlled lab environment, instead of beneath the earth. Using either HPHT (High Pressure High Temperature) or CVD (Chemical Vapour Deposition), a small diamond seed is exposed to the same conditions that form natural diamonds, just compressed into weeks instead of billions of years.
What you get is a diamond that’s chemically, physically and optically identical to a natural one. Same carbon structure, same hardness, same brilliance. The only difference is where it came from.
Our best settings for your round cut lab grown diamond
A round cut lab grown diamond is the most versatile shape available, working beautifully across every jewellery style. Here’s how to make the most of yours:
Three-Stone Ring
A round cut centre stone flanked by two smaller diamonds, symbolising your past, present and future. This setting works beautifully with 1ct to 2ct round cut diamonds. Our Morning star yellow gold trilogy engagement ring is a stunning example, pairing a brilliant round cut centre stone with two perfectly matched side diamonds in a timeless yellow gold setting.
Stud Earrings
Want something you can wear every single day? A matched pair of 3 Claw Round Stud Earrings in Yellow Gold round cut lab grown diamonds catches light beautifully from every angle, even at smaller carats.
Tennis Bracelet
If you love a piece that sparkles with every move, you’ll love this one. Our 1.00ct tennis bracelet in yellow gold is one of our customers’ favourites, it’s the piece people keep coming back for.
Hidden Halo
At Flawless, we love designs that surprise you. Our Sadie Platinum Engagement Ring tucks a circle of smaller lab grown diamonds just beneath the centre stone, giving you that extra brilliance no one sees coming, until it catches the light.
Toi et Moi Ring
This is one of our favourite designs to create, two stones, one story. Our Moi Et Toi Round and Marquise Diamond Engagement Ring in Yellow Gold brings your round cut diamond together with a marquise stone, a design our customers keep coming back to ask for.
What We Can Do For You at Flawless
At Flawless, every round cut lab grown diamond can be custom set into the setting of your choice, in yellow gold, white gold, rose gold or platinum. Our team can help you choose the perfect carat, cut and setting combination to match your style and budget, and every piece is handcrafted in-house.
Browse by Carat:
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Our Best Recommendation:
1ct, Excellent Cut, G Colour, VS2 Clarity — the perfect balance of size, brilliance and value. Our best-selling lab grown round cut diamond.
Round Cut Lab Grown Diamonds - FAQs
What makes round cut lab grown diamonds the most popular shape?
What makes round cut lab grown diamonds the most popular shape?
Round cut lab grown diamonds feature 57 or 58 facets, designed to maximize light reflection and sparkle. Their balanced proportions make them the most versatile and desired choice for engagement rings and fine jewellery.
How do I choose the right carat weight for a lab grown round diamond?
How do I choose the right carat weight for a lab grown round diamond?
Focus on a balance between carat weight, cut quality, and measurements. Since cut influences sparkle more than size alone, a well-cut 1.0ct lab grown round diamond can look brighter than a poorly cut larger stone.
How long does it take to receive a custom ring with a loose lab grown diamond?
How long does it take to receive a custom ring with a loose lab grown diamond?
Once you’ve chosen your diamond and setting, custom rings are typically handcrafted within a few weeks. Contact our team for an exact timeline based on your chosen design.
What is the best cut, colour and clarity combination for a lab grown round diamond?
What is the best cut, colour and clarity combination for a lab grown round diamond?
For the best balance of brilliance and value, choose an Excellent cut, G colour and VS2 clarity. This combination looks stunning to the naked eye while keeping the price sensible.
How does a round cut lab grown diamond compare to fancy shapes?
How does a round cut lab grown diamond compare to fancy shapes?
Round cuts have more facets, so they reflect more light and sparkle more than fancy shapes. That’s why they’re the most popular and usually the most expensive per carat. Fancy shapes like oval or cushion sparkle a bit less but tend to look larger for the same carat weight and cost less.
Can I customise the setting for my loose round cut lab grown diamond?
Can I customise the setting for my loose round cut lab grown diamond?
Yes. At Flawless, every loose diamond can be set into a custom ring, pendant or earring design of your choice, in your preferred metal, allowing you to create a completely personalised piece.
Why is cut quality important in a round cut lab grown diamond?
Why is cut quality important in a round cut lab grown diamond?
Cut quality matters because precise faceting helps minimise the visibility of flaws. An ideal cut reflects maximum light through the top of the diamond, helping to reduce the appearance of inclusions and slight colour tint.
What certification should I look for when buying a lab grown diamond?
What certification should I look for when buying a lab grown diamond?
Always choose a lab grown diamond certified by GIA, IGI or HRD. These certificates confirm the diamond’s cut, colour, clarity and carat weight, ensuring you know exactly what you’re buying.
What is a good length-to-width ratio for a round cut lab grown diamond?
What is a good length-to-width ratio for a round cut lab grown diamond?
For a round diamond, the ideal length-to-width ratio is 1.00, meaning the stone is perfectly circular. A ratio between 1.00 and 1.02 is considered excellent, while up to 1.03–1.05 is still acceptable and hard to notice with the naked eye. Anything higher indicates the diamond is slightly out-of-round, which can make it look less symmetrical.
Is buying a lab grown diamond a good investment for the future?
Is buying a lab grown diamond a good investment for the future?
Lab grown diamonds are best valued for their beauty and affordability rather than investment potential. If resale value is a priority, natural diamonds typically hold value better over time.
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