Buy 3 Ct Lab-Grown Diamond Engagement Ring

When you're ready to make a grand gesture of love, only the boldest brilliance will do. Our 3-carat lab-grown diamond engagement ring, crafted in 100% solid 14K and 18K gold, is designed to impress—without compromising your values. With IGI-certified lab-grown diamonds, these rings offer exceptional sparkle, clarity, and size—at a smart price, not an inflated one.

Each piece is handmade, hypoallergenic, and shipped free across the UK, complete with full certification and luxury packaging. At The Karat Store, we believe your forever ring should be as breathtaking as your story.

Show 9 12 18 24

History, Types, Cultural Significance Of Lab-Grown Diamond Engagement Ring

A 3 ct engagement ring makes an undeniable statement—bold, elegant, and unforgettable. It’s the ring for those who believe in celebrating love in the biggest way, with a diamond that truly stands out. And thanks to lab-grown technology, you can enjoy this extraordinary size without sacrificing quality or ethics.

Our collection features:

Solitaires that let the diamond shine
Halo and double-halo rings that add extra sparkle
Three-stone styles with meaningful symbolism
Split-shank and hidden halo settings
Available in round, oval, emerald, cushion, princess, and pear cuts

UK shoppers love lab-grown diamonds because they offer real luxury, responsible sourcing, and unmatched value. A 3 ct lab-grown ring isn’t just about size—it’s about love, intention, and a commitment to beauty with integrity.

Quality of Material Used

Every engagement ring is made using solid 14K & 18K gold—not plated or gold-filled. Choose from yellow, white, or rose gold for a finish that suits your style and skin tone.

Our lab-grown diamonds are ethically created, expertly selected, and hand-set by skilled artisans. All rings are hypoallergenic, safe for sensitive skin, and built for everyday elegance.

Certifications Provided

Each 3-carat lab-grown diamond ring includes:

An IGI certificate verifying carat, cut, clarity, and origin
A 14K & 18K gold purity stamp
A detailed invoice and authenticity documentation

This is fine jewellery you can trust—backed by certification, transparency, and craftsmanship.

Craftsmanship

From the first sketch to the final polish, each ring is handcrafted by master jewellers with precision and care. Every diamond is carefully set, every finish is polished to perfection, and every ring is individually inspected before it ships.

Because when you're proposing forever, the ring should reflect nothing less.

Frequently Asked Questions

1. How long does shipping take to the UK?
Shipping takes 12 to 22 days to your doorstep in the UK.

2. Are your diamonds and gold real?
Yes. All rings are made with IGI-certified lab-grown diamonds and 100% solid 14K & 18K gold.

3. How do lab-grown diamonds compare to mined ones?
They’re identical in every way—same look, strength, and brilliance—just more sustainable and affordable.

4. Will my ring come with certification?
Yes. Every ring includes an IGI certificate, a 14K & 18K gold stamp, and full documentation.

5. What is your return policy?
Returns are accepted only for damaged items or if the wrong ring is delivered.

6. Is shipping free in the UK?
Yes, we offer free shipping across all 50 states.

7. Will I receive tracking information?
Absolutely. A tracking number will be emailed once your ring ships.

8. Can I customize my 3 ct ring?
Yes! We accept custom orders—email us with your design or preferred specifications.

9. Are the rings safe for sensitive skin?
Yes, all rings are nickel-free and hypoallergenic, perfect for daily wear.

10. How do I contact The Karat Store?
Reach out to us at contact@thekaratstore.uk for questions, custom requests, or order support.