3 Carat Lab Grown Diamonds

Explore our curated selection of IGI-certified 3 Carat Lab Grown Diamonds—real diamonds, responsibly grown, and precision-graded for lasting value.

Filter
    63 products
    About 3 Carat Lab Grown Diamonds +

    3 Carat Lab Grown Diamonds – Exceptional Presence and Modern Brilliance

    A 3 carat lab grown diamond offers remarkable size, refined elegance and outstanding brilliance, making it a preferred choice for UK customers seeking high-impact luxury. With a commanding visual presence and excellent light performance, a 3 carat diamond is ideal for statement engagement rings, fine jewellery settings and investment-grade pieces.

    Produced using advanced CVD and HPHT technology, lab grown diamonds share the exact chemical structure, hardness and brilliance of mined diamonds — the only difference is their ethical, above-ground origin. At Variation, every 3 carat diamond is IGI-certified and carefully selected for cut precision, clarity and symmetry to ensure exceptional beauty and long-lasting value.


    What Is a 3 Carat Lab Grown Diamond?

    A 3 carat diamond weighs 0.6 grams and delivers substantial size and radiance, making it an extraordinary centre stone for premium jewellery. Lab grown diamonds follow the same crystallisation process as natural diamonds, ensuring identical brilliance, fire and durability — with a sustainable and ethical approach.

    Key Characteristics

    • 100% real diamonds with identical physical and chemical composition to mined stones

    • High brilliance, fire and impressive visual scale

    • Ideal for luxury engagement rings and statement jewellery

    • IGI-certified for grading accuracy and authenticity

    • Ethical, sustainable and fully traceable origin

    For UK customers seeking standout brilliance with responsible sourcing, 3 carat lab grown diamonds offer an exceptional combination of beauty and value.


    Why Choose 3 Carat Lab Grown Diamonds from Variation?

    Variation is trusted across the United Kingdom for its commitment to precision, ethical quality and transparent value. Every 3 carat diamond is selected with strict criteria, focusing on cut quality — the most influential factor in achieving maximum brilliance.

    Why UK Customers Prefer Variation

    • Premium IGI-certified diamonds

    • Top colour grades (D–F)

    • High clarity standards (VVS1–VS2)

    • Conflict-free and ethical sourcing

    • Direct-from-manufacturer value

    These qualities ensure that every 3 carat Variation diamond delivers exceptional brilliance, structure and purity.


    Popular Shapes in 3 Carat Lab Grown Diamonds

    Variation offers a wide range of shapes, each engineered for superior brilliance, symmetry and refined aesthetics at the 3 carat size.

    Best-Selling Shapes

    • Round Cut – Maximum brilliance and balanced proportions

    • Oval Cut – Elongated elegance with radiant sparkle

    • Princess Cut – Sharp geometry and contemporary brilliance

    • Emerald Cut – Step-cut clarity with sophisticated appeal

    • Cushion Cut – Romantic shape with soft, glowing fire

    • Pear Cut – Graceful silhouette and brilliant sparkle

    • Radiant Cut – Bold fire and crisp edges

    • Marquise Cut – Dramatic lengthening effect

    • Heart Cut – Symbolic brilliance with expressive beauty

    • Hexagon & Trillion Cuts – Distinctive and modern alternatives

    Each shape is proportioned to maximise fire, symmetry and light performance at this premium carat weight.


    IGI Certification – Trusted Assurance for UK Buyers

    Every 3 carat lab grown diamond from Variation includes a full IGI certificate, ensuring clarity in grading, proportions and authenticity.

    Your IGI Certificate Verifies

    • Cut grade and symmetry

    • Colour grade (D–F)

    • Clarity grade (VVS1–VS2)

    • Carat weight and measurements

    • Laser inscription for identification

    With IGI documentation, UK buyers enjoy complete confidence when purchasing a high-value stone online.


    Ethical Creation and Responsible Value

    Variation diamonds are grown using sustainable processes that significantly reduce environmental impact while ensuring precise crystal growth and exceptional beauty.

    Our Ethical Commitments

    • Zero mining and reduced ecological impact

    • Fully traceable production

    • Lower carbon footprint than mined diamonds

    • Inventory-free, responsible sourcing

    • Transparent pricing and provenance

    These principles offer UK buyers a responsible alternative to traditionally sourced diamonds, without compromising quality.


    Ideal for Engagement Rings, Luxury Jewellery and Bespoke Designs

    A 3 carat diamond delivers exceptional scale and presence, making it ideal for:

    • Engagement rings

    • Statement solitaire pendants

    • High-end stud earrings

    • Luxury necklaces and bracelets

    • Bespoke fine jewellery

    Its substantial size allows for dramatic brilliance and bold visual impact in any setting.


    UK-Wide Delivery and Transparent Value

    Variation offers secure, insured and trackable delivery throughout the United Kingdom, ensuring a safe and trusted shopping experience.

    You receive:

    • IGI-certified 3 carat lab grown diamond

    • Direct-from-manufacturer pricing

    • Transparent and consistent value

    • Secure UK-wide delivery

    • Authenticity documentation

    Our value-first approach ensures fair pricing aligned with UK customer expectations for premium diamonds.


    Modern Brilliance with Responsible Luxury

    3 carat lab grown diamonds from Variation deliver extraordinary presence, clarity and brilliance. They are an exceptional choice for UK customers seeking refined luxury, certified quality and sustainable value.

    Explore Variation’s 3 carat lab grown diamonds today and discover brilliance shaped by innovation, craftsmanship and ethical creation.

    Frequently Asked Questions +
    Is a 3 carat lab grown diamond considered a luxury size? +
    Yes. A 3 carat diamond is widely regarded as a luxury, high-impact size. It has a commanding presence, exceptional visibility, and is often chosen for premium engagement rings, statement solitaires, and upscale fine jewellery pieces.
    How large does a 3 carat diamond look compared to a 2 carat or 1 carat diamond? +
    A 3 carat diamond appears significantly larger — not just by weight, but by surface area. Depending on the shape, a 3 carat stone can look 40–60% larger than a 2 carat, and more than double the visual size of a 1 carat diamond.
    Are 3 carat lab grown diamonds more affordable than mined diamonds of the same size? +
    Yes — the cost difference is substantial. A 3 carat lab grown diamond can be up to 70–80% more affordable than a mined diamond of the same cut, clarity, and color, making large diamonds more achievable for modern buyers.
    Do 3 carat lab grown diamonds sparkle as much as natural diamonds of the same size? +
    Absolutely. Since lab grown diamonds are real diamonds with identical physical and optical properties, a well-cut 3 carat stone will offer exceptional brilliance, fire, and scintillation just like a natural diamond of equivalent quality.
    Which clarity and color grades are recommended for a 3 carat diamond? +
    Larger diamonds show inclusions more easily, so most buyers prefer D–F color and VVS1–VS1 clarity to maintain a bright, clean look. However, cut quality should always be the top priority for maximizing light performance.
    Do 3 carat lab grown diamonds come with IGI or GIA certification? +
    Yes. Most 3 carat lab grown diamonds are certified by leading gemological laboratories such as IGI or GIA, ensuring transparency on the diamond’s 4Cs, polish, symmetry, and growth method.
    Are 3 carat diamonds practical for everyday wear in engagement rings? +
    Yes — as long as they are set securely. A strong setting such as a 4-prong, 6-prong, bezel, or cathedral design helps protect the stone while maintaining comfort and stability for daily wear.
    Which shapes look biggest in the 3 carat range? +
    Shapes like oval, pear, radiant, emerald, and marquise appear especially large due to their elongated proportions and larger face-up area, while round diamonds emphasize brilliance and fire more than apparent size.
    Is a 3 carat lab grown diamond good for pendants or earrings? +
    Definitely. A 3 carat solitaire makes a luxurious pendant with a bold presence, and 1.5 carat each stones create premium stud earrings with excellent sparkle and balance.
    Are there many options available in the 3 carat lab grown diamond category? +
    Yes. You can choose from a wide selection of shapes (round, oval, emerald, radiant, pear, cushion, marquise, princess, fancy shapes), clarity grades, colors, and cut qualities within the 3 carat range, making it easy to find one that suits your style and budget.
    Shape Guide

    3 Carat Lab Grown Diamonds by Shape

    Explore 3 Carat Lab Grown Diamond shapes and compare cut style, face-up presence, and brilliance to find the outline that best suits your preference.

    The most iconic diamond shape with unmatched brilliance and timeless appeal.
    Elegant and elongated with a large face-up look and flattering outline.
    Soft, pillowy edges paired with exceptional fire and brilliance.
    Clean step-cut facets for a sophisticated hall-of-mirrors effect.
    A flattering, tapered silhouette with excellent finger coverage.
    Bright, bold sparkle with cropped corners for a modern look.
    A geometric square profile delivering brilliant sparkle and symmetry.
    Distinctive pointed tips and an elongated form for maximum spread.
    A meaningful, romantic shape with a beautifully defined cleft.
    A bold geometric design ideal for modern and artistic jewellery.