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Hatton Garden diamonds
Choose from hand-selected, GIA and IGI certified diamonds in every popular shape. Our Hatton Garden gemmologists check each stone for brilliance, not just its paperwork, so the diamond you choose looks as good on the hand as it does on the certificate.
Lab-grown or natural
Lab-grown and natural diamonds are physically, chemically and optically the same. What differs is origin, rarity and price. We will show you both side by side and let you decide.
More diamond for your budget
Created above ground with the same crystal structure as a mined diamond. A lab-grown stone lets you choose a larger carat or a higher grade for the same budget.
Rare and timeless
Formed deep within the earth over billions of years, every natural diamond is finite and one of a kind, a classic choice for an heirloom ring.
| Feature | Lab-grown diamonds | Natural diamonds |
|---|---|---|
| Appearance | Identical sparkle, fire and brilliance | Identical sparkle, fire and brilliance |
| Composition | Pure crystallised carbon | Pure crystallised carbon |
| Hardness | 10 on the Mohs scale | 10 on the Mohs scale |
| Origin | Grown in a controlled lab in weeks | Formed in the earth over billions of years |
| Certification | IGI or GIA | GIA |
| Price | Considerably lower for the same grade | Higher, reflecting natural rarity |
| Best for | Maximising size and quality on a budget | Heirloom value and natural rarity |
Want the full picture? Read our lab-grown vs natural diamonds guide.
Create your ring
However you like to begin, you can pair any certified diamond with any of our settings, handcrafted to order in Hatton Garden.
Become a diamond expert
Every certified diamond is graded for cut, colour, clarity and carat. Here’s where our gemmologists suggest you spend, and where you can save.
Read the full diamond education guideCut grades how well a diamond’s facets return light to your eye. It does more for sparkle than any other C, which is why we never compromise on it.
Gemmologist tip: Prioritise Excellent cut for round diamonds. A well-cut stone can look larger and brighter than a heavier, poorly cut one.
Colour runs from D (completely colourless) to Z (light yellow). Differences across neighbouring grades are almost impossible to see once the diamond is set.
Gemmologist tip: F–H looks icy white in platinum or white gold. In yellow or rose gold you can often drop to I or J and put the saving into carat.
Clarity measures tiny natural inclusions. Most are microscopic, so the real question is whether a diamond is “eye-clean”, with nothing visible from normal viewing distance.
Gemmologist tip: VS2 and many SI1 diamonds are eye-clean. Emerald and Asscher cuts show more, so we suggest VS1 or above for step cuts.
Carat is a measure of weight, not size. Two diamonds of the same carat can face up differently depending on their cut and proportions.
Gemmologist tip: Prices jump at whole and half carats. A 0.90ct diamond can look almost identical to a 1.00ct and cost noticeably less.
Certified diamonds
Every Primo diamond comes with an independent grading report from GIA or IGI, the two most trusted laboratories in the world. Before we recommend a stone, our gemmologists inspect it themselves for light performance and eye-cleanliness, because two diamonds with the same certificate can look very different.
Ethically sourced
We work only with trusted suppliers who follow the Kimberley Process and the System of Warranties for natural diamonds, and who can trace the origin of every lab-grown diamond. Once you have chosen your stone, it is set by hand in our Hatton Garden workshop.
Diamond guides
Guide
Diamond educationCut, colour, clarity and carat explained
Read guide
Guide
Diamond shapesHow each shape reflects light differently
Read guide
Guide
Lab-grown vs naturalThe honest differences, side by side
Read guide
Guide
Engagement ring buying guideStyle, metal and budget: where to begin
Read guide
Diamond FAQs
Straight answers from our Hatton Garden gemmologists. Can’t see your question? We are happy to help.
Yes. Every diamond we offer comes with an independent grading report from GIA or IGI. The report confirms the stone’s cut, colour, clarity and carat, and its number is usually laser-inscribed on the diamond’s girdle so you can verify it.
Lab-grown and natural diamonds share the same chemical composition, hardness and sparkle. Natural diamonds formed in the earth over billions of years; lab-grown diamonds are created in weeks under controlled conditions. The main practical difference is price: a lab-grown diamond costs considerably less than a natural diamond of the same grade.
Not with the naked eye, or even a standard jeweller’s loupe. Specialist laboratory equipment is needed to tell them apart, which is why every diamond’s certificate states clearly whether it is lab-grown or natural.
Cut has the biggest impact on how a diamond looks, because it controls sparkle and brightness. We recommend an Excellent or Very Good cut, then balancing colour, clarity and carat to suit your budget and setting.
For most engagement rings, F to H colour and VS2 to SI1 clarity look beautifully white and eye-clean while giving excellent value. Step cuts such as emerald and Asscher show more of the stone’s interior, so we usually suggest VS1 or above for those shapes.
Yes. Each diamond is certified, and you can view it in high-definition 360° video before you decide. If you would like to see it in person, book an appointment at our Hatton Garden showroom or a virtual consultation with one of our gemmologists.
Our natural diamonds are sourced in line with the Kimberley Process and the System of Warranties, and our lab-grown diamonds come from suppliers who can trace their origin. We are happy to talk you through the provenance of any stone.
Of course. Book a private appointment at our showroom in Hatton Garden and we will bring in the diamonds you have shortlisted so you can compare them side by side under different lighting.
Yes. Choose any certified diamond and pair it with one of our settings, or work with our designers on a bespoke ring. Every ring is handcrafted to order in our Hatton Garden workshop.
Most engagement rings are ready within 2–4 weeks of design approval, depending on the setting and diamond. We will give you a clear timeline during your consultation.
Diamonds in Hatton Garden
Primo Diamonds is an independent Hatton Garden jeweller offering GIA and IGI certified lab-grown and natural diamonds online and in our London showroom.
Choosing a diamond is easier with someone you trust beside you. Our gemmologists help you compare loose diamonds across every major shape, including round brilliant, oval, emerald, pear and cushion, and explain how cut, colour, clarity and carat change both appearance and price.
Lab-grown diamonds are real diamonds with the same physical and optical properties as natural stones. They are an excellent way to choose a larger or higher-grade diamond for your engagement ring, and each one comes with an independent IGI or GIA report.
For a rare, heirloom-quality stone, our natural diamonds are GIA graded and responsibly sourced. We hand-select each one for brilliance and eye-cleanliness, not just its grades on paper.
Book a free appointment to view diamonds side by side, try on settings and plan a bespoke ring with our in-house goldsmiths. You can also learn more in our diamond education guide.
Your diamond, your way
Search certified diamonds online, or book a private consultation with a Hatton Garden gemmologist, in-store or virtual, at a time that suits you.
