Una Diamond – Lab-Grown Diamond Engagement Rings
Mine, not mined.
Custom lab-grown diamond rings that don't cost the earth
Discover the one.
Lab-grown diamonds, styled without compromise. Find the ring that’s unapologetically yours.
Diamonds, just because.
Not every diamond marks an engagement. Some are just for you.
Made for the two of you.
Choosing an engagement ring should feel like choosing something for the two of you, not settling for whatever a jeweller happens to have in the case. Every ring we make begins with an IGI certified lab-grown diamond, which is a real diamond in every way that counts. It looks and wears exactly like a mined stone, and it will for the rest of your life. The only difference is how it’s made: grown in a lab rather than dug from the ground, which is why the same budget stretches to a bigger, better diamond. You choose the cut, the metal and the size, and we make the ring by hand once you order it, in solid 18K gold or platinum, with engraving included. It takes around six weeks. What you end up with is real fine jewellery, made specifically for you, without the markup that usually comes attached.
Book a free styling consult
One on one advice from our team to help you choose with confidence.
Shop our best sellers
A family story set in stone
Their band uses five lab grown diamonds, chosen for their clarity, story and symbolism. Every stone stands in for someone in their family. Instead of passing down a mined legacy, they’re building a new one entirely on their own terms.
They said yes, then they said this
Discover why customers give us 5 stars
Rings in real moments
Create your own Una Diamond ring
Choose your metal, diamond, and setting. Handmade in 6 weeks, entirely yours.
Why More People Are Choosing Lab-Grown
Sustainable Luxury
Lab-grown diamonds avoid the destructive mining process. You get the same brilliance with a lighter footprint, so your ring reflects your values as much as your style.
Certified Quality
Every diamond is graded by the International Gemological Institute (IGI). Cut, clarity, carat, color - verified by global standards so you know exactly what you’re buying.
Design First
Our designs draw from timeless icons but are built for now. Lab-grown gives us freedom to focus on proportion, detail, and modern wearability without compromise.
True Value
Lab-grown means more diamond for your spend - often 30-40% more. That could mean a larger stone, finer cut, or the freedom to invest in the setting you actually want.
UNA x FOREVER PROJECTS
Every ring gives back
We’ve partnered with Forever Projects to donate 1% of all diamond sales through Pledge 1%, helping mothers break the cycle of poverty and build a brighter future. Every Una Diamond purchase helps fund food, education, and startup support for women and families in Tanzania.
FAQ
What are lab-grown diamonds?
Lab-grown diamonds are diamonds that are created in a controlled laboratory environment using technological processes that replicate the natural conditions under which diamonds form in the earth.
Are lab-grown diamonds real diamonds?
Yes, lab-grown diamonds are chemically and optically identical to mined diamonds. They have the same physical, chemical, and optical properties as natural diamonds.
How are lab-grown diamonds different from mined diamonds?
The main difference is their origin: lab-grown diamonds are created in a laboratory, while mined diamonds are naturally occurring gems extracted from the earth through mining.
Can lab-grown diamonds be certified?
Yes, our lab-grown diamonds are IGI certified just like mined diamonds.
Are lab-grown diamonds more affordable than mined diamonds?
Generally, yes. Lab-grown diamonds are often priced at a more competitive point compared to natural diamonds of similar quality, making them a cost-effective choice.
Can lab-grown diamonds be customized?
Yes, lab-grown diamonds can be customized into various shapes and sizes, and they can be set in different metals and settings according to your preferences.
How do I find my ring size?
We recommend visiting a local jeweller for a professional sizing. Alternatively, you can use our free Ring Size Guide, which walks you through measuring at home with a simple piece of string or a strip of paper. Ring size can vary slightly throughout the day — measure in the evening when fingers are at their largest for the most accurate result. All Una Diamond rings are made to your exact specification, so getting this right first time matters. If you're unsure, we're always happy to advise via our styling consult.
What is your returns policy?
Because every Una Diamond ring is made to order to your exact specifications, we are unable to accept returns or exchanges for change of mind. However, if your ring arrives with a manufacturing fault, we will repair or replace it at no cost to you. We stand behind the quality of everything we make. Full details are available on our Returns & Refunds page.
Can I design a fully custom ring?
Yes. Every ring in the Una Diamond collection is made to order, which means your choice of diamond shape, carat weight, metal (18K yellow gold, rose gold, or platinum), and ring size is built into the process from the start. We also offer bespoke commissions for couples who have a specific design in mind — a silhouette not available in our current collection, a family heirloom reimagined, or something entirely original. Book a styling consult to explore what's possible.