Shopping for a diamond can feel overwhelming when you’re not sure where to buy certified diamonds or which retailers you can trust. You need independent certification from reputable labs like GIA or IGI to guarantee you’re getting what you pay for. Without proper certification, you risk overpaying for a lower quality stone or falling victim to misleading claims about cut, clarity, and colour grades.

This guide covers five trusted UK retailers where you can purchase certified diamonds with confidence. Each retailer offers independently certified stones, transparent pricing, and expert guidance to help you make an informed decision. We’ll look at what diamonds they stock, how they verify quality, and how their buying process works. Whether you prefer shopping online or visiting a physical showroom, these retailers provide the certification and support you need to invest wisely in your diamond.

1. A Star Diamonds

A Star Diamonds operates as a family-run jeweller in Hatton Garden, London’s historic diamond district. You get direct access to in-house goldsmiths, designers, and gemologists who guide you through the entire ring creation process. Their approach centres on bespoke design, meaning they create engagement rings and wedding bands tailored to your specifications rather than selling mass-produced pieces.

Diamond and jewellery selection

You can choose from natural and lab-grown diamonds sourced through ethical channels. A Star Diamonds stocks various engagement ring styles including solitaire, diamond band, and hidden halo settings. Their online shop displays ready-made options, but their core service focuses on custom design work where you work directly with craftsmen to create something unique. All their jewellery is UK-made in their Hatton Garden workshop, giving you the ability to see where your ring takes shape.

Certification and quality assurance

Every diamond comes with independent certification from recognized laboratories such as GIA or IGI. Their gemologists educate you on the 4Cs (cut, clarity, colour, and carat weight) before you select your stone. A Star Diamonds guarantees their lab-grown diamonds are 100% conflict-free, and they apply the same ethical standards to their natural diamond sourcing.

"Their gemologists educate you on the 4Cs before you select your stone."

How to buy from them

You start by booking a consultation either in person at their Hatton Garden location or through an online appointment. During this session, you discuss your vision, budget, and diamond preferences. They provide lifetime benefits including free resizing, polishing, cleaning, and complimentary engraving. You can reach them by phone or WhatsApp for initial inquiries, and their process typically involves multiple touchpoints to refine your design before production begins.

2. 77 Diamonds

77 Diamonds operates as a leading online diamond retailer serving the UK market with an extensive inventory of certified stones. You access their platform entirely online, where you can browse thousands of loose diamonds and engagement ring settings. Their business model focuses on digital sales with optional in-person consultations at their London showroom.

Diamond and jewellery selection

Their inventory includes over 100,000 certified diamonds spanning natural and lab-grown options. You can filter by specific criteria including cut, colour, clarity, and carat weight through their online search tools. 77 Diamonds stocks various setting styles from classic solitaires to modern halo designs, and they offer custom design services where you select your diamond and setting separately.

Certification and quality assurance

Every diamond on their platform carries certification from GIA, IGI, or HRD laboratories. You receive detailed grading reports with each purchase, and their website displays high-resolution images and 360-degree videos of individual stones. This transparency lets you examine cut quality and clarity characteristics before buying.

"You receive detailed grading reports with each purchase."

How to buy from them

You browse their online inventory using advanced filtering tools to narrow your search. Their team provides consultations via phone, email, or video call to guide your selection. 77 Diamonds offers free UK delivery and a 60-day return policy on all purchases.

3. Queensmith

Queensmith operates as a Hatton Garden specialist focusing on bespoke engagement rings and fine jewellery. You work directly with master craftsmen and gemologists at their London workshop, where they design and manufacture custom pieces. Their approach combines traditional goldsmithing techniques with modern diamond sourcing, giving you access to certified stones and personalized service.

Diamond and jewellery selection

You select from natural and lab-grown diamonds across various price points and quality grades. Queensmith stocks loose certified diamonds that you can pair with custom settings designed specifically for your preferences. Their craftsmen create solitaire, halo, vintage, and contemporary styles, all produced in their Hatton Garden workshop. This in-house manufacturing means you see your ring take shape from initial sketch to final polish.

Certification and quality assurance

Each diamond carries certification from GIA or IGI laboratories, providing verified grading for cut, clarity, colour, and carat weight. Their gemologists explain these certifications during consultations and help you understand how grades affect value and appearance. Queensmith guarantees all their stones meet the standards stated in independent reports.

"Their gemologists explain these certifications during consultations."

How to buy from them

You begin by booking a consultation at their Hatton Garden showroom, where you discuss design ideas and view certified diamonds. Their team provides detailed quotes before production starts, and they maintain communication throughout the crafting process.

4. Goldsmiths

Goldsmiths operates as one of the UK’s largest jewellery retailers with over 200 stores nationwide and a comprehensive online platform. You access certified diamonds and engagement rings through their physical locations or website, making them convenient if you prefer browsing multiple options in person. Their established presence since 1778 gives you the backing of a long-standing retailer with widespread recognition.

Diamond and jewellery selection

Their inventory includes natural diamonds in various cuts and carat weights across solitaire, halo, and trilogy engagement ring styles. You browse collections from branded designers and their own ranges, giving you both exclusive and accessible options. Goldsmiths stocks ready-made rings alongside customizable settings where you select your preferred diamond and mounting.

Certification and quality assurance

Each diamond comes with certification from recognized laboratories including GIA and IGI. Their in-store gemologists provide guidance on certification details and help you interpret grading reports. Goldsmiths guarantees the authenticity of all certified diamonds sold through their channels.

"Their in-store gemologists provide guidance on certification details."

How to buy from them

You visit any of their UK store locations or shop through their online platform. Their staff offer consultations to help you understand diamond quality and pricing. Goldsmiths provides insurance options and warranties on purchases, plus flexible payment plans for larger investments.

5. Quality Diamonds

Quality Diamonds operates as a specialist diamond retailer with both online and physical showroom presence in the UK. You access their services through their website or by visiting their location, where they focus exclusively on certified loose diamonds and custom engagement rings. Their business model centres on providing competitive pricing through direct sourcing relationships with diamond suppliers.

Diamond and jewellery selection

Their inventory features certified loose diamonds across various price points, giving you flexibility to match your budget with your desired specifications. You can select from round brilliant, princess, oval, and cushion cuts in both natural and lab-grown options. Quality Diamonds offers bespoke setting services where you choose your diamond separately from your mounting, allowing complete control over the final design.

Certification and quality assurance

Every diamond carries certification from GIA or IGI laboratories, providing verified grading information for your purchase. Their team explains how certification affects pricing and value, helping you understand the relationship between grades and cost. Quality Diamonds guarantees all stones match their certification details.

"Their team explains how certification affects pricing and value."

How to buy from them

You browse their online diamond inventory using search filters or book a consultation to view stones in person. Their experts guide you through selection and provide quotes for complete rings including your chosen diamond and setting.

Finding the right diamond retailer

Choosing where to buy certified diamonds requires you to verify independent certification from GIA or IGI and assess the retailer’s expertise in guiding your purchase. Each retailer in this guide offers certified stones with transparent grading information, but your decision depends on whether you value bespoke design services, extensive online inventories, or convenient high street access. The certification guarantees quality, yet the buying experience and after-sales support differ significantly between retailers.

Your investment deserves both proper certification and skilled craftsmanship to create a ring that matches your vision. Consider factors like in-house manufacturing, lifetime maintenance benefits, and the retailer’s ability to educate you throughout the process. If you want personalized service combined with ethically sourced diamonds and UK-made craftsmanship, A Star Diamonds in Hatton Garden provides expert guidance from gemologists and goldsmiths who create bespoke engagement rings tailored to your specifications, complete with lifetime benefits including free resizing and cleaning.