Black Lab Grown Fancy Diamonds

What is a black lab grown diamond?

A black lab grown diamond is a genuine diamond — chemically and physically identical to a mined stone — produced in a laboratory environment and coloured black by a high concentration of graphite inclusions, polycrystalline growth, or surface fractures that absorb rather than transmit light. Unlike most fancy colour diamonds, whose colour arises from trace elements or structural lattice distortions, a black diamond achieves its appearance through near-total light absorption. Lab grown versions replicate this process under controlled high-pressure, high-temperature (HPHT) or chemical vapour deposition (CVD) conditions. The result is a stone with the same 10 Mohs hardness as any other diamond, the same chemical composition, and a distinctive, near-opaque black face that reads differently from colourless or pastel fancy diamonds. Certifying laboratories evaluate these stones on cut, carat weight, and colour uniformity rather than the standard 4C grading applied to colourless diamonds.

How does a black lab grown diamond compare to a natural black diamond?

Black lab grown diamonds and natural black diamonds share the same physical properties and visual character — both present that dense, absorbed-light appearance — but they differ in origin and, typically, in cost per carat. Natural black diamonds, sometimes referred to by the Portuguese term carbonado, are among the oldest diamond formations on record and are mined in limited quantities, primarily in Brazil and the Central African Republic. Lab grown black diamonds remove the supply constraint, meaning larger carat weights are more accessible at a given budget. Both types are certified to the same standard: every black lab grown diamond stocked by President Jewellers carries a GIA, HRD or IGI certificate. For buyers for whom provenance and long-term rarity matter, a natural black diamond may be preferred; for those prioritising carat size and per-carat value, the lab grown route is a practical alternative — and the visual result is indistinguishable to the eye.

What settings and metals suit a black lab grown diamond?

A black lab grown diamond pairs most effectively with high-contrast metalwork. White metals — platinum and white gold — set the near-opaque black face against a clean, neutral ground, sharpening the visual boundary between stone and setting. Yellow gold and rose gold create a warmer, more deliberate contrast; this combination reads as intentional and architectural rather than incidental. Bezel settings work particularly well with black lab grown diamonds because the continuous metal surround frames the stone cleanly and protects its edges, which, while hard, can be more brittle than colourless diamonds due to the internal fracture network that creates the black appearance. Claw settings are achievable but benefit from thicker, well-proportioned claws. Pavé halos of colourless or white diamonds around a black lab grown centre stone produce a strong graphic effect. Setting choice should reflect whether the aim is to let the black diamond anchor a bold design or to integrate it into a more intricate composition.

What does a black lab grown diamond cost in the UK?

Black lab grown diamonds are generally priced more accessibly per carat than natural black diamonds and significantly more accessibly than colourless lab grown diamonds of equivalent size. The reduced per-carat cost is partly because black diamonds are not graded on clarity and colour in the same way as colourless stones, and partly because lab production removes the supply scarcity that underpins natural stone pricing. Carat weight, cut precision, and certification body are the principal price drivers. For context, Bridebook's 2026 UK average engagement ring spend sits at £2,247 — a black lab grown diamond can deliver a visually dominant stone well within that figure, particularly in larger carat weights that would be considerably more expensive in colourless or other fancy colour alternatives. All black lab grown diamonds are available loose for purchase, or they can be set into one of our rings with a 7–14 working day lead time from order confirmation.

How to buy and return a loose black lab grown diamond

Every black lab grown diamond on this page is available to purchase loose, with complimentary insured UK delivery included as standard. Each stone is certified — GIA, HRD or IGI — so the colour grade, carat weight, and cut specification are fully documented before purchase. Returns are accepted within 30 days, no questions asked, with no exclusions. If a black lab grown diamond is selected to be set into one of our rings, the process moves to our Hatton Garden workshop: a CAD design is produced, a silver or wax sample is prepared for try-on by appointment, and the finished ring is hallmarked at the London Assay Office before insured delivery. Lead time from order confirmation is 7–14 working days, depending on setting complexity. A lifetime warranty and free resizing accompany every finished ring.