Lab-grown diamonds now offer the same brilliance, hardness, and fire as mined stones, at a fraction of the cost. If you’re searching for the best value lab grown diamonds, you’re making a smart move: these gems are chemically identical to natural diamonds, yet typically cost 30-50% less for the same carat weight and quality.

But where should you actually buy one in the UK? Not all retailers offer the same transparency, craftsmanship, or after-sales care. At A Star Diamonds, we’ve spent years working with both natural and lab-grown stones in our Hatton Garden workshop, so we understand what separates a genuine bargain from a false economy.

This guide breaks down 12 of the best places to buy lab-grown diamonds in the UK, covering online retailers, high-street jewellers, and bespoke specialists. We’ll help you find exceptional quality without overpaying, whether you’re after an engagement ring, wedding band, or statement piece.

1. A Star Diamonds

A Star Diamonds operates from a Hatton Garden workshop where your ring is crafted from start to finish, not outsourced to overseas manufacturers. This family-run jeweller specialises in bespoke lab-grown engagement rings and wedding bands, combining personal service with competitive pricing on certified stones.

What makes it good value

You get UK-made craftsmanship at prices that reflect A Star Diamonds’ direct sourcing model. Because they control the entire process, from diamond selection to final polishing, you avoid the markup that comes from middlemen. Their lifetime benefits package includes free resizing, polishing, and cleaning, which saves you hundreds of pounds over the life of your ring.

"The combination of in-house production and lifetime aftercare means you’re investing in a relationship, not just a transaction."

Best for

A Star Diamonds suits you if you want expert guidance through every stage of the design process. Their goldsmiths, designers, and gemologists work together to translate your ideas into a finished piece, making them particularly strong for couples who value collaborative design over catalogue selection. You’ll appreciate this approach if you’re choosing between natural and lab-grown diamonds and need honest advice.

Diamond quality and certification

They source 100% conflict-free lab-grown diamonds alongside ethically certified natural stones. Each diamond comes with full certification from recognised laboratories, and their gemologists explain the 4Cs in practical terms during your consultation. You can view stones in person at their Hatton Garden showroom or arrange a virtual appointment with high-resolution imagery.

Customisation and design options

Full bespoke service is their strength. You can create entirely unique designs or modify existing styles, with CAD renders and wax models provided before casting. Their team works with platinum, gold (white, yellow, rose), and various settings including solitaire, halo, and pavé. Free engraving is included with every purchase, letting you add a personal message without additional cost.

Pricing and fees to expect

Lab-grown diamond rings start from around £800 depending on carat weight and setting complexity. You’ll receive transparent quotes with no hidden fees, and their pricing reflects the best value lab grown diamonds available through independent UK workshops. Payment plans are available for larger purchases, and there’s no pressure to upsell to higher specifications than you need.

Delivery, returns, resizing and aftercare

UK delivery typically takes 4-6 weeks for bespoke pieces, with international shipping available. You get a comprehensive warranty covering manufacturing defects, plus lifetime resizing, polishing, and cleaning at no charge. Their Hatton Garden location means you can drop your ring off for maintenance whenever you’re in London, or arrange insured postal service if you live elsewhere.

2. Queensmith

Queensmith runs a Hatton Garden workshop alongside a user-friendly online platform, letting you design custom engagement rings with lab-grown diamonds at transparent prices. Their team of experienced jewellers handles all production in London, combining traditional craftsmanship with modern digital design tools to create pieces that fit your specifications.

What makes it good value

Their pricing structure reflects direct workshop costs without retail store overheads, though you pay slightly more than pure online retailers for their hands-on service. You benefit from free consultations with their design team, who guide you through diamond selection and setting options without pushy sales tactics. Their lifetime warranty covers manufacturing defects at no additional charge.

Best for

Queensmith works well if you want professional design input but prefer browsing diamonds online before visiting their showroom. Their platform suits tech-savvy couples who appreciate CAD visualisations and 360-degree diamond views, then finalise details in person at their Hatton Garden location.

Diamond quality and certification

They stock IGI and GIA certified lab-grown diamonds across all standard shapes and sizes. Each stone comes with full grading reports, and their website filters let you search by cut quality, colour grade, and clarity. You can request additional photography for any diamond before committing to a purchase.

"Queensmith’s combination of online browsing and in-person finishing gives you flexibility without sacrificing expertise."

Customisation and design options

Full bespoke design is available, with 3D CAD models generated for approval before production starts. Their designers work across classic and contemporary styles in platinum, white gold, yellow gold, and rose gold. You’ll see wax prototypes for complex designs before final casting.

Pricing and fees to expect

Lab-grown engagement rings typically start from £1,200 depending on diamond specifications and metalwork complexity. Their quotes include VAT and all design fees, with no surprise charges at checkout. They offer interest-free payment plans for purchases over £1,000.

Delivery, returns, resizing and aftercare

Production takes 4-8 weeks for custom pieces, with tracked UK delivery included. You get a 30-day return window and one complimentary resize within the first year. Their workshop provides ongoing cleaning and maintenance services, though you’ll pay for resizing after the initial period.

3. Diamonds Factory

Diamonds Factory operates both online and through multiple UK showrooms, offering lab-grown diamonds with competitive pricing backed by decades of experience in the jewellery trade. Their platform lets you build custom rings by selecting loose stones from their inventory, then pairing them with settings from their catalogue or requesting bespoke designs.

What makes it good value

Their established supply chain delivers lower prices per carat compared to high-street retailers, particularly on larger stones above 1.5 carats. You benefit from transparent pricing across their entire inventory, with no hidden consultation fees or design charges for standard settings. Their London showrooms provide viewing appointments at no cost, letting you compare stones in person before purchasing.

Best for

Diamonds Factory suits you if you want choice over guidance. Their extensive inventory works well for shoppers who’ve researched diamond specifications and prefer selecting from existing options rather than collaborative design sessions.

Diamond quality and certification

They stock IGI certified lab-grown diamonds with full grading reports accessible through their website. Their inventory covers all standard shapes, with filters for cut, colour, clarity, and carat weight. Each stone listing includes high-resolution photography showing the diamond from multiple angles.

"Diamonds Factory’s established supply network gives you access to competitive pricing on certified stones across all common specifications."

Customisation and design options

You can pair loose diamonds with preset ring designs or request modifications to existing styles. Their team handles platinum, white gold, yellow gold, and rose gold settings, though their strength lies in catalogue selection rather than fully bespoke pieces from scratch.

Pricing and fees to expect

Lab-grown engagement rings start from approximately £600 for smaller stones in simple settings. Their pricing reflects volume purchasing power, making them competitive for straightforward designs without extensive customisation.

Delivery, returns, resizing and aftercare

Standard UK delivery takes 2-3 weeks for custom orders, with tracked shipping included. You receive a 30-day return period and warranty covering manufacturing defects. One free resize is offered within 60 days of purchase, with ongoing maintenance services available at their showrooms.

4. 77 Diamonds

77 Diamonds operates as an online-first retailer with a London showroom, focusing on lab-grown diamonds through a build-your-own-ring platform. Their technology-driven approach combines 3D design tools with competitive pricing on certified stones, letting you visualise your ring before committing to a purchase. Their streamlined process cuts out traditional retail overheads while maintaining quality standards.

What makes it good value

Their direct-to-consumer model eliminates showroom costs across multiple locations, passing savings to you through lower per-carat pricing. You access their entire lab-grown diamond inventory online with transparent pricing that updates in real time. Their platform provides side-by-side comparisons of similar stones, helping you identify the best value lab grown diamonds within your budget without sales pressure.

Best for

77 Diamonds suits you if you prefer digital shopping with occasional in-person verification. Their system works well for couples who research independently online but want the option to view shortlisted stones at their London location before finalising purchases.

Diamond quality and certification

They stock IGI and GIA certified lab-grown diamonds with complete grading reports linked to each listing. Their inventory includes round, princess, cushion, and emerald cuts across standard colour and clarity grades. You can filter by specific certification parameters and request additional photography for any stone.

Customisation and design options

You select from preset ring designs spanning classic solitaires to modern halos, with metal options in platinum and gold. Their 3D configurator shows your chosen diamond in different settings before production begins. Limited bespoke modifications are available for existing designs.

Pricing and fees to expect

Lab-grown engagement rings typically start from £900 depending on diamond size and setting complexity. Their transparent pricing includes all taxes and standard shipping, with no hidden design fees for catalogue selections.

Delivery, returns, resizing and aftercare

Production takes 3-4 weeks for standard orders, with free UK delivery on completed rings. You receive a 60-day return window and one complimentary resize within the first year. Their warranty covers manufacturing defects, with maintenance services available through their London showroom.

5. Taylor and Hart

Taylor and Hart specialises in bespoke lab-grown engagement rings through a combination of online design tools and London showroom consultations. Their platform lets you co-create rings with their design team, using 3D rendering technology to visualise every detail before production begins. They’ve built their reputation on personalised service that transforms your ideas into finished jewellery.

What makes it good value

Their transparent pricing model shows exact costs for diamonds and metalwork separately, letting you adjust specifications to fit your budget without compromise. You receive unlimited design revisions at no extra charge, meaning you can refine your ring until it matches your vision perfectly. Their in-house London workshop handles all manufacturing, reducing costs compared to retailers who outsource production overseas.

Best for

Taylor and Hart suits you if you want creative involvement throughout the design process. Their service works particularly well for couples with specific design ideas who need expert guidance to make them technically feasible, rather than those preferring quick catalogue purchases.

"Their collaborative approach means you work directly with designers who understand both aesthetic preferences and structural requirements."

Diamond quality and certification

They source IGI certified lab-grown diamonds with full grading reports provided for every stone. Their inventory includes round, oval, cushion, and emerald cuts across standard colour and clarity grades. You can review certification details during your design consultation before finalising diamond selection.

Customisation and design options

Full bespoke design forms their core offering. You receive photorealistic 3D renders showing your ring from multiple angles, followed by physical wax models for complex pieces. Their designers work with platinum, white gold, yellow gold, and rose gold across any setting style you envision.

Pricing and fees to expect

Lab-grown engagement rings typically start from £1,500 depending on diamond specifications and design complexity. Their quotes include all design work and production costs, with no hidden fees for revisions or consultations.

Delivery, returns, resizing and aftercare

Production takes 6-8 weeks for bespoke pieces, with free UK delivery included. You get a 60-day return period and one complimentary resize within the first year. Their warranty covers manufacturing defects, with ongoing maintenance available through their London workshop.

6. Flawless Fine Jewellery

Flawless Fine Jewellery operates as a London-based retailer specialising in lab-grown diamond engagement rings and fine jewellery. Their approach combines competitive online pricing with showroom appointments, letting you browse their curated collection digitally before viewing selected pieces in person. They focus on contemporary designs that appeal to modern couples seeking ethical alternatives to mined diamonds.

What makes it good value

Their streamlined inventory reduces overhead costs compared to traditional high-street jewellers, passing savings directly to you through lower pricing on certified lab-grown diamonds. You benefit from their transparent cost structure that shows clear breakdowns of diamond and setting prices separately. Their competitive positioning offers solid value for couples prioritising affordability without sacrificing quality standards.

Best for

Flawless Fine Jewellery suits you if you prefer contemporary ring styles with straightforward purchasing processes. Their service works well for shoppers who’ve researched diamond specifications independently and want access to certified stones at accessible price points without extensive customisation requirements.

Diamond quality and certification

They stock certified lab-grown diamonds with grading reports from recognised laboratories. Their inventory covers standard shapes including round, princess, and cushion cuts across typical colour and clarity grades. You can request certification details for any diamond listed on their platform before making purchase decisions.

Customisation and design options

You select from their existing ring designs with options to modify metal types and diamond specifications. Their collection includes solitaire, halo, and pavé settings in platinum, white gold, yellow gold, and rose gold. Limited bespoke modifications are available for preset styles.

"Their focus on contemporary designs and accessible pricing makes them a practical choice for budget-conscious couples."

Pricing and fees to expect

Lab-grown engagement rings typically start from approximately £700 depending on diamond size and setting selection. Their pricing includes standard shipping within the UK, with no hidden consultation fees for catalogue purchases.

Delivery, returns, resizing and aftercare

Standard delivery takes 2-4 weeks for in-stock items, with tracked shipping provided. You receive a 30-day return period and warranty covering manufacturing defects. Their aftercare services include cleaning and maintenance through their London location.

7. Warren James

Warren James operates as a high-street jeweller with over 200 stores across the UK, offering lab-grown diamond rings through both their retail locations and online platform. Their accessible presence in shopping centres nationwide makes them a convenient option for couples who prefer browsing in person before purchasing, with competitive pricing aimed at budget-conscious shoppers.

What makes it good value

Their volume purchasing power translates to lower prices on entry-level lab-grown diamond jewellery compared to independent retailers. You access their inventory through walk-in stores without appointment fees, letting you view multiple pieces during regular shopping trips. Their frequent promotional offers provide additional savings on already affordable baseline pricing.

Best for

Warren James suits you if you want immediate availability through high-street shopping. Their service works well for couples seeking straightforward purchases without extensive design consultations, particularly those comfortable selecting from preset collections rather than bespoke creations.

Diamond quality and certification

They stock lab-grown diamonds across their engagement ring collection, though certification details vary by product line. Their staff can provide grading information for specific pieces, with standard clarity and colour grades available across their inventory.

Customisation and design options

You select from their existing catalogue of ring designs with limited modification options. Their collection includes classic solitaires and halo settings in white gold, yellow gold, and rose gold. Bespoke design services are not their primary offering.

"Warren James brings lab-grown diamonds to the high street with accessible pricing and widespread store availability."

Pricing and fees to expect

Lab-grown engagement rings start from approximately £400 for smaller stones in simple settings. Their competitive pricing reflects high-street positioning, making them among the most affordable options for basic designs.

Delivery, returns, resizing and aftercare

In-store purchases offer immediate collection, while online orders typically arrive within 5-7 working days. You receive a 30-day return period and warranty coverage, with resizing services available through their store network for an additional fee.

8. Moon Ocean

Moon Ocean positions itself as a specialist online retailer for lab-grown diamond jewellery, offering engagement rings and wedding bands through their e-commerce platform. Their business model focuses on direct sourcing from certified manufacturers, cutting out traditional retail markups to provide competitive pricing on ethically created diamonds. They serve UK customers through their website with delivery partnerships across the country.

What makes it good value

Their online-only operation eliminates showroom costs, letting you access lower prices on certified lab-grown diamonds compared to physical retailers. You benefit from their transparent pricing structure that displays diamond specifications alongside corresponding costs. Their competitive positioning makes them worth considering when searching for the best value lab grown diamonds within strict budget parameters.

Best for

Moon Ocean suits you if you’re comfortable with fully remote purchases without in-person viewing appointments. Their platform works well for confident online shoppers who understand diamond grading and prefer quick transactions over extended consultations.

Diamond quality and certification

They stock certified lab-grown diamonds with grading reports from recognised laboratories. Their inventory includes standard cuts across typical colour and clarity grades, with certification details available for each stone listed on their platform.

"Moon Ocean’s streamlined approach delivers accessible pricing for customers comfortable with digital-first purchasing."

Customisation and design options

You select from their preset ring designs with options to modify diamond specifications and metal types. Their collection includes classic settings in white gold, yellow gold, and rose gold, though extensive bespoke design services are not their primary focus.

Pricing and fees to expect

Lab-grown engagement rings typically start from around £500 depending on diamond size and setting choice. Their pricing includes standard UK delivery, with transparent costs displayed throughout the checkout process.

Delivery, returns, resizing and aftercare

Standard delivery takes 2-3 weeks for most orders, with tracked shipping provided. You receive a 30-day return window and warranty covering manufacturing defects. Their customer service team handles aftercare queries through email and phone support.

9. Vashi

Vashi operates multiple UK showrooms alongside their online platform, offering lab-grown diamond jewellery with a focus on contemporary designs and transparent pricing. Their business model combines in-house manufacturing with direct customer relationships, eliminating traditional retail markups whilst maintaining quality standards across their engagement ring collections.

What makes it good value

Their vertically integrated production means you pay workshop prices rather than retail margins. You benefit from their transparent pricing that shows exact costs for diamonds and settings separately, letting you make informed decisions within your budget. Their showroom network provides free consultations without appointment pressure.

Best for

Vashi suits you if you want showroom access with online convenience. Their service works well for couples who prefer viewing diamonds in person across London, Birmingham, Manchester, or Leeds locations before purchasing.

Diamond quality and certification

They stock IGI certified lab-grown diamonds with full grading reports provided for each stone. Their inventory covers round, oval, cushion, and princess cuts across standard colour and clarity grades, with certification details accessible during consultations.

Customisation and design options

You can select from their existing designs or work with their team on bespoke modifications. Their collection includes classic and modern settings in platinum, white gold, yellow gold, and rose gold. They provide CAD visualisations for custom pieces before production begins.

"Vashi’s combination of showroom accessibility and competitive pricing makes them a practical option for finding the best value lab grown diamonds."

Pricing and fees to expect

Lab-grown engagement rings typically start from approximately £800 depending on diamond specifications and setting complexity. Their pricing includes consultation services and standard modifications to catalogue designs.

Delivery, returns, resizing and aftercare

Standard production takes 3-5 weeks for custom orders, with free UK delivery provided. You receive a 60-day return period and warranty covering manufacturing defects. Their showrooms offer ongoing cleaning and maintenance services.

10. Beaverbrooks

Beaverbrooks operates as a family-run jeweller with over 70 stores across the UK, offering lab-grown diamond engagement rings through their retail locations and online platform. Their fourth-generation business combines traditional jewellery expertise with modern ethical sourcing, providing certified lab-grown diamonds alongside comprehensive customer service and lifetime care packages.

What makes it good value

Their established reputation for customer care translates to generous aftercare benefits that extend well beyond your initial purchase. You receive lifetime free cleaning and maintenance at any of their UK stores, saving you ongoing costs throughout your ring’s lifespan. Their competitive pricing reflects high-street positioning whilst maintaining quality standards above budget retailers.

Best for

Beaverbrooks suits you if you value long-term customer relationships over rock-bottom prices. Their service works particularly well for couples who appreciate face-to-face consultations in accessible high-street locations rather than exclusive showroom appointments.

Diamond quality and certification

They stock certified lab-grown diamonds with grading reports from recognised laboratories. Their inventory covers standard cuts across typical colour and clarity specifications, with staff trained to explain certification details during in-store consultations.

"Beaverbrooks’ commitment to lifetime aftercare makes them stand out among high-street retailers offering lab-grown diamonds."

Customisation and design options

You select from their existing ring collections with options to modify metal types and diamond specifications. Their range includes classic solitaires and contemporary designs in platinum, white gold, yellow gold, and rose gold.

Pricing and fees to expect

Lab-grown engagement rings typically start from approximately £600 depending on diamond size and setting choice. Their pricing includes consultation services and warranty coverage, with transparent costs displayed in-store and online.

Delivery, returns, resizing and aftercare

Standard delivery takes 1-2 weeks for most orders, with in-store collection available. You receive a 45-day return period and comprehensive warranty. Their lifetime free cleaning, checking, and rhodium plating services provide exceptional ongoing value through their nationwide store network.

11. H Samuel

H Samuel operates as one of the UK’s largest high-street jewellers with over 300 stores nationwide, offering lab-grown diamond engagement rings through both their retail locations and online platform. Their widespread presence across shopping centres and retail parks makes them among the most accessible options for couples wanting to view rings in person without travelling to specialist districts like Hatton Garden.

What makes it good value

Their mass-market positioning delivers competitive pricing on entry-level lab-grown diamond jewellery through economies of scale. You benefit from regular promotional offers and seasonal sales that reduce costs further below their standard pricing. Their nationwide store network means you can visit during normal shopping hours without booking specialist appointments.

Best for

H Samuel suits you if you prioritise convenience and accessibility over bespoke design services. Their offering works well for shoppers seeking straightforward purchases from established high-street brands with immediate availability.

Diamond quality and certification

They stock lab-grown diamonds across their engagement ring collections with varying certification levels. Their retail staff can provide grading information for specific pieces, though certification details depend on individual product lines within their inventory.

"H Samuel brings lab-grown diamonds to the high street with unmatched store accessibility across the UK."

Customisation and design options

You select from their existing catalogue with limited modification capabilities. Their collection includes traditional solitaires and cluster designs in white gold, yellow gold, and rose gold, focusing on classic styles rather than contemporary or bespoke creations.

Pricing and fees to expect

Lab-grown engagement rings start from approximately £350 for smaller stones in basic settings. Their competitive high-street pricing positions them among the most affordable options for finding the best value lab grown diamonds in preset designs.

Delivery, returns, resizing and aftercare

In-store purchases offer immediate collection, whilst online orders typically arrive within 5-10 working days. You receive a 30-day return period and warranty coverage, with resizing and maintenance services available through their extensive store network for additional fees.

12. Blue Nile

Blue Nile operates as a US-based online retailer with international shipping to the UK, offering one of the largest inventories of lab-grown diamonds available through their build-your-own-ring platform. Their established e-commerce presence since 1999 provides extensive selection across diamond specifications, though UK customers need to consider import procedures and potential customs implications when ordering from their American operation.

What makes it good value

Their massive diamond inventory gives you access to competitive pricing through volume purchasing power typically found with large-scale retailers. You benefit from their transparent pricing structure that displays exact costs for loose diamonds and settings separately. Their established reputation in the online diamond market provides confidence for remote purchases, though UK buyers should factor potential customs duties into total costs.

Best for

Blue Nile suits you if you want maximum choice in diamond selection and feel comfortable navigating international purchases. Their platform works well for experienced online shoppers who understand diamond specifications and prioritise inventory breadth over local showroom access.

Diamond quality and certification

They stock GIA and IGI certified lab-grown diamonds with full grading reports accessible through their website. Their inventory covers all standard shapes across comprehensive colour and clarity ranges, with high-resolution photography and 360-degree videos for most stones.

"Blue Nile’s extensive inventory provides unmatched selection for finding the best value lab grown diamonds within specific specification requirements."

Customisation and design options

You select from their preset ring designs or build custom combinations using their online configurator. Their collection includes classic and contemporary settings in platinum and gold, with detailed imagery showing your chosen diamond in different mounting styles.

Pricing and fees to expect

Lab-grown engagement rings typically start from approximately £700 depending on specifications, though you must add UK customs duties and VAT to displayed US prices. Their checkout process calculates estimated import costs before finalising purchases.

Delivery, returns, resizing and aftercare

International delivery takes 3-4 weeks including customs clearance. You receive a 30-day return period and warranty covering manufacturing defects, though return shipping costs fall to you for international orders.

Final tips before you buy

Compare certification standards across retailers before making your final decision. IGI and GIA reports both provide reliable grading, but you should verify that each diamond comes with its own certificate showing cut, colour, clarity, and carat specifications. Request high-resolution photography or video for any stone you’re considering, particularly if you’re buying online without viewing it first.

Budget for the total cost including any resizing, insurance, and ongoing maintenance fees. Some retailers offer lifetime benefits that save you hundreds of pounds over time, whilst others charge for every service after your initial purchase. Calculate these additional expenses when comparing the best value lab grown diamonds across different jewellers.

Visit our Hatton Garden workshop to view certified lab-grown diamonds in person and discuss your requirements with our gemologists, who can guide you through selecting a stone that fits both your budget and quality expectations.