Blue Lab Grown Fancy Diamonds

What is a blue lab grown fancy diamond?

A blue lab grown fancy diamond is a genuine diamond — chemically, optically and physically identical to a mined stone — grown in a laboratory and coloured blue through the introduction of boron during the growth process. Boron atoms replace a small proportion of carbon in the crystal lattice, absorbing red and yellow light wavelengths and transmitting blue. The depth of colour depends on boron concentration: trace amounts produce a faint or very light blue, while higher concentrations yield intense or vivid grades. GIA, HRD and IGI each grade blue lab grown diamonds on the same fancy-colour scale used for natural stones — from Faint through to Fancy Vivid — so the colour descriptor on the certificate carries the same meaning regardless of origin.

How do blue lab grown diamonds compare to natural blue diamonds?

Blue lab grown diamonds and natural blue diamonds share the same physical and optical properties, but differ substantially in rarity and price per carat. Natural blue diamonds are among the rarest coloured diamonds on earth — the blue colour in a mined stone results from boron absorbed over billions of years under extreme geological conditions. Lab grown equivalents replicate that boron-inclusion process in weeks, making Fancy Intense and Fancy Vivid blue grades far more accessible at a given budget. For buyers focused on visible colour saturation per pound spent, lab grown blue diamonds offer a clear advantage. For those placing weight on natural provenance and long-term resale, the natural blue diamond remains in a separate category — and both are available from President Jewellers.

What certification covers blue lab grown fancy diamonds?

Every blue lab grown fancy diamond offered here is certified by GIA, HRD or IGI — three internationally recognised grading laboratories that assess fancy-colour diamonds on colour grade, colour distribution, clarity, cut and carat weight. The colour grade is the most critical certificate entry for a blue diamond: look for the intensity descriptor (Fancy Light, Fancy, Fancy Intense, Fancy Vivid) alongside the secondary hue modifier, which may note a green-blue or grey-blue undertone. A greyish modifier typically reduces desirability; a pure blue or greenish-blue with no grey commands a premium. The certificate number is laser-inscribed on the girdle of the stone, allowing the document to be verified directly with the issuing laboratory.

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

Blue lab grown fancy diamonds vary in price according to colour intensity grade, carat weight, clarity and cut quality — with colour intensity being the dominant driver. A Fancy Light blue in a smaller carat weight sits at the more accessible end of the range, while a Fancy Vivid blue in a larger stone commands a significant premium. Lab grown production has made blue colour grades achievable at budgets where natural blue diamonds of comparable intensity would be far out of reach. Bridebook's 2026 UK average engagement ring spend of £2,247 provides a useful reference point, though blue fancy-colour diamonds are frequently chosen for dress rings, pendants and gifts beyond the engagement-ring context.

How to set a blue lab grown diamond into a ring

When a blue lab grown diamond is selected for setting, the process moves to our Hatton Garden workshop, where design begins with CAD modelling followed by a silver or wax sample for try-on before casting. Metal choice significantly affects how the blue colour is perceived: platinum and white gold keep the stone's blue tone true to the certificate grade; yellow gold introduces warmth that can shift perception slightly toward green-blue; rose gold creates a contrast that lifts the blue by opposition. The finished ring is hallmarked at the London Assay Office and delivered by insured UK courier. Lead time runs to 7-14 working days from order confirmation, with more intricate settings at the longer end of that range.