3.7mm Black Round Brilliant Natural Diamond
Special Offer
Buy 5 Get 5% Off
Buy 10 Get 10% Off
Buy 20 Get 15% Off
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Estimated Delivery:16 Oct - 20 Oct
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Free Shipping: On all UK orders and international orders over £50
3.7mm Black Round Brilliant Natural Melee Diamonds – Calibrated Loose Diamonds
Precision-calibrated 3.7mm Black Round Brilliant natural melee diamonds selected for consistency in size, cut and overall appearance. Featuring a distinctive deep black colour, these loose diamonds are ideal for statement jewellery, earrings, pendants, jewellery repairs and bespoke designs.
Diamond Specifications
- Size: 3.7mm
- Approx. Carat Weight: 0.20ct per diamond
- Shape: Round Brilliant
- Diamond Type: Natural
- Colour: Black
- Cut: Excellent
- Calibration: +0.04mm
- Certification: Uncertified
Carat weight is approximate and may vary slightly between individual diamonds.
Precision-Calibrated Black Diamonds
Our 3.7mm natural black diamonds are precision calibrated to a tight +0.04mm tolerance, providing consistent sizing for jewellery making, matching stones, replacement stones and bespoke settings. Each diamond is carefully selected for its overall appearance, colour and consistency.
Black Round Brilliant Cut Diamonds
The Round Brilliant Cut combines a classic circular outline with faceted surfaces that complement the distinctive appearance of black diamonds. Unlike colourless diamonds, which are valued for their brilliance and fire, black diamonds are prized for their deep colour, striking contrast and contemporary aesthetic.
Consistent Black Colour
Our natural black diamonds are selected for their consistent dark appearance, making them suitable for matching stones and multi-stone jewellery designs. Their distinctive colour creates a striking contrast when paired with white diamonds, coloured gemstones or precious metals.
Jewellery Making & Repairs
3.7mm Black Round Brilliant natural diamonds are suitable for a wide range of jewellery applications, including rings, earrings, pendants, statement jewellery, replacement stones and bespoke designs.
Whether you're a professional jeweller, designer or sourcing a replacement diamond, our calibrated loose black diamonds provide a consistent and convenient option for stone setting.
Loose Natural Black Diamonds
The Carat Club supplies loose natural black 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.
Ethically Sourced & Conflict-Free
Our natural melee diamonds are ethically sourced, conflict-free and responsibly mined. Every diamond is carefully selected from trusted suppliers, giving jewellers and designers confidence in the quality and origin of every stone
Unmatched Brilliance with Precision-Cut
Our natural melee diamonds are expertly cut to maximise brilliance, fire and scintillation. Available in calibrated sizes, they offer exceptional consistency in cut, colour and clarity, making them ideal for engagement rings, wedding bands, jewellery repairs and bespoke fine jewellery