4.5mm Round Brilliant Lab Grown Diamond
Special Offer
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Estimated Delivery:13 Oct - 17 Oct
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Free Shipping: On all UK orders and international orders over £50
4.5mm Round Brilliant Lab Grown Diamond – Calibrated Loose Diamond
Precision-calibrated 4.5mm Round Brilliant lab grown diamonds selected for consistency in size, cut and overall quality. Available in D–E colour with a choice of SI, VS and VVS clarity, these loose diamonds are ideal for jewellery making, repairs and bespoke designs.
Diamond Specifications
- Size: 4.5mm
- Approx. Carat Weight: 0.36ct
- Shape: Round Brilliant
- Diamond Type: Lab Grown
- Colour: D–E
- Clarity: VVS, VS or SI
- Cut: Excellent
- Calibration: ±0.04mm
- Certification: Uncertified
Carat weight is approximate and may vary slightly between individual diamonds.
Precision-Calibrated Lab Grown Diamonds
Our 4.5mm lab grown diamonds are precision calibrated to a tight ±0.04mm tolerance, providing consistent sizing for jewellery making, replacement stones and bespoke settings. Each diamond is carefully selected for its overall appearance, cut and consistency.
Excellent Cut & Brilliance
Each Round Brilliant diamond is selected for its cut, brilliance and consistency. The classic Round Brilliant facet pattern delivers excellent sparkle and light performance, making it a versatile choice for a wide range of fine jewellery designs.
Clarity Options for Every Project
Choose from VVS, VS or SI clarity to suit the requirements and budget of your project. VVS offers the highest clarity within the range, VS provides an excellent balance of clarity and value, while SI offers a more price-conscious option while maintaining an attractive face-up appearance.
Jewellery Making & Repairs
4.5mm Round Brilliant lab grown diamonds are suitable for a wide range of jewellery applications, including engagement rings, earrings, pendants, jewellery repairs and bespoke designs.
Whether you're a professional jeweller, designer or sourcing a replacement diamond, our calibrated loose diamonds provide a consistent and convenient option for stone setting.
Loose Lab Grown Diamonds
The Carat Club supplies loose lab grown diamonds across a wide range of calibrated sizes, making it easy to source stones for new jewellery, existing settings and repair work.
United Kingdom
Royal Mail Tracked 24 - free for all UK orders up to £200
Royal Mail Special Delivery - free for orders over £200
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International
Royal Mail International Tracked & Signed — free on orders over £50, otherwise £6.99
FedEx Connect Plus — free for orders over £300
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Customs & Duties
International orders outside the UK may be subject to customs duties and import taxes upon delivery, which are the buyer's responsibility.
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Dispatch Times
Round melee dispatched within 2 business days.
Fancy melee and certified diamonds within 5 business days.
UK delivery in 1 business day from dispatch.
International delivery in 3–5 business days from dispatch.
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Returns
We’re committed to your complete satisfaction. Enjoy hassle-free returns or exchanges on all items within 30 days of delivery.
Top Grade Rough
Our lab grown melee diamonds are created using the High Pressure High Temperature (HPHT) growth process, which replicates the natural conditions deep within the Earth's mantle. This produces exceptional colourless, high-clarity diamonds that require no post-growth treatments. Every diamond offers the same physical, chemical and optical properties as a natural diamond
The Perfect Cut
Every lab grown melee diamond is expertly cut to maximise brilliance, fire and scintillation. Precision calibration ensures each stone matches the required dimensions, with a manufacturing tolerance of just ±0.04 mm, making them ideal for pavé setting, micro-setting, engagement rings, wedding bands, jewellery repairs and fine jewellery manufacturing