Ethically grown lab-grown diamonds — certified, bespoke, and crafted by hand.

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Free Insured UK Delivery✦10% Off Your First Order — Code WELCOME10✦Complimentary Gift Packaging✦Certified Lab-Grown Diamonds✦Bespoke Design at No Extra Cost✦Free IGI Certificate✦30-Day Easy Returns✦Free Insured UK Delivery✦10% Off Your First Order — Code WELCOME10✦Complimentary Gift Packaging✦Certified Lab-Grown Diamonds✦Bespoke Design at No Extra Cost✦Free IGI Certificate✦30-Day Easy Returns✦
Certified Diamonds
Hand-Crafted
Ethically Grown
Free Insured Delivery
30-Day Returns
24/7 Support
Exclusive Welcome Offer

Enjoy 10% Off Your First Order

Complimentary gift packaging · Free insured UK delivery · Use code WELCOME10 at checkout.

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Featured Collections

Explore Our Collections

Engagement Rings Discover → Wedding Rings Discover → Necklaces Discover → Earrings Discover → Bracelets Discover → Bespoke Discover →
Your Ring. Your Story. Your Diamond. ✦ Custom Lab-Grown Engagement Rings, Made to Order ✦ Your Ring. Your Story. Your Diamond. ✦ Custom Lab-Grown Engagement Rings, Made to Order ✦
Most Loved

Our Best Sellers

5 Stone Pear Cut Engagement Ring in Yellow Gold 5 Stone Pear Cut Engagement Ring in Yellow Gold Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £754.29.Current price is: £528.00. Three Stone Oval Cut Engagement Ring Three Stone Oval Cut Engagement Ring Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,458.57.Current price is: £1,021.00. Hidden Halo Oval Cut Engagement Ring Hidden Halo Oval Cut Engagement Ring Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,458.57.Current price is: £1,021.00. Pave Hexagon Cut Engagement Ring Pave Hexagon Cut Engagement Ring Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,540.00.Current price is: £1,078.00. Floral Hexagon Cut Engagement Ring in Sterling Silver Floral Hexagon Cut Engagement Ring in Sterling Silver Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,540.00.Current price is: £1,078.00. Vintage Round Cut Engagement Ring in Yellow Gold Vintage Round Cut Engagement Ring in Yellow Gold Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,501.43.Current price is: £1,051.00. Cluster Round Cut Engagement Ring Cluster Round Cut Engagement Ring Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,010.00.Current price is: £707.00. Bezel Cushion Cut Engagement Ring in Platinum Bezel Cushion Cut Engagement Ring in Platinum Lab-grown diamond, hand-set in solid gold with a free IGI certificate. Original price was: £1,291.43.Current price is: £904.00.
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Variety of Diamond

Shop by Diamond Shape

From timeless round brilliants to elegant emerald cuts — find the shape that tells your story.

Round cut diamond Round Oval cut diamond Oval Pear cut diamond Pear Cushion cut diamond Cushion Emerald cut diamond Emerald Princess cut diamond Princess Radiant cut diamond Radiant Marquise cut diamond Marquise Asscher cut diamond Asscher Heart cut diamond Heart Baguette cut diamond Baguette
Dream It.•Design It.•Wear It.

A diamond for every story — designed around you.

Bespoke Jewellery

Dream It. We’ll Craft It.

Share your idea, sketch or inspiration and our designers will create a one-of-a-kind piece — a ring as unique as your moment.

Start Your Bespoke Journey Contact Us
The CarbonstoneUK Promise

Why Choose Us

Certified & Verifiable

Free IGI certificate for the centre diamond — verify your 4Cs online with total confidence.

Ethically Grown

Lab-grown, 100% conflict-free diamonds — the same fire and brilliance, responsibly created.

Bespoke Craftsmanship

Hand-made in solid gold & platinum, designed around you at no extra design cost.

Looked After

Free engraving, final photos before dispatch and dedicated aftercare for life.

Loved by Our Customers

Rated Excellent

★★★★★ Reviews powered by Trustpilot
★★★★★

My engagement ring is absolutely stunning — even more beautiful than the photos. The team guided me through every step and the diamond certificate gave me total peace of mind.

Sophie M. · Verified purchase
★★★★★

Designed a bespoke ring from a rough sketch and the result exceeded every expectation. Faultless craftsmanship and genuinely lovely people to deal with.

James R. · Verified purchase
★★★★★

Fast, secure delivery and the packaging was gorgeous. The lab-grown diamond sparkles incredibly — I get compliments constantly. Highly recommend.

Priya K. · Verified purchase
Bespoke Stories

Our Recent Custom Creations

From your first sketch to a ring you’ll treasure forever — a few pieces we’ve recently crafted around our customers’ stories.

Bespoke CreationCustom Oval Three-Stone Bespoke CreationBespoke Emerald Solitaire Bespoke CreationHand-Made Halo Design
Create Your Own
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CarbonstoneUKJewellery Store · North Harrow, London
  • Flat 1, 61A Station Rd, North Harrow, Harrow HA2 7SR
  • +44 7748 460039
  • Open 24 hours · Virtual appointments available
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