Oval Lab Grown Diamonds

What is an oval lab grown diamond?

An oval lab grown diamond is a diamond crystallised in a laboratory using either HPHT or CVD methods, then cut into an elongated brilliant shape with 57 or 58 facets. Chemically, optically and physically it is identical to a mined diamond. The oval cut traces back to Lazare Kaplan's 1957 refinement of the modern brilliant, taking the fire of a round and stretching it along a length-to-width ratio typically between 1.30 and 1.50. Lab grown ovals appeal to buyers who want a larger spread on the finger for the budget — an oval reads visibly larger than a round of the same carat weight, and the lab origin compounds that value. Every stone we list carries a report from GIA, HRD or IGI detailing the 4Cs, measurements and any treatments.

How to choose an oval lab grown diamond

Start with the length-to-width ratio. Most buyers prefer 1.35 to 1.45 for a classic oval silhouette; below 1.30 reads almost round, above 1.50 looks distinctly elongated. Next, check the certificate for a bow-tie — a dark shadow across the centre caused by light leakage. Lab grown ovals can show pronounced bow-ties, so request video or images before committing. For colour, oval cuts retain warmth at the tips, so G or H grades sit safely white in platinum or white gold, while I and J grades pair well with yellow gold. Clarity of VS2 or SI1 is generally eye-clean at this shape, with inclusions easier to hide near the ends. Carat weight tends to display generously: a 1.5ct oval often presents like a 1.75ct round on the hand.

What does an oval lab grown diamond cost in the UK?

Oval lab grown diamonds are typically priced 60 to 80 per cent below natural ovals of comparable spec, with the gap widening at larger carats. Price drivers remain the 4Cs — carat weight, colour, clarity and cut quality — alongside the certifying laboratory. For context, Bridebook's 2026 UK average engagement ring spend of £2,247 stretches considerably further with a lab grown oval, often allowing a buyer to step up a full carat grade or move from SI to VS clarity while staying within budget. Carat thresholds at 1.0ct, 1.5ct and 2.0ct mark visible jumps in price. Lab grown stones hold less resale value than naturals, so the choice often depends on whether long-term value matters more than size and spec at point of purchase.

Buying a loose oval lab grown diamond or having it set

Every oval lab grown diamond on this page can be purchased loose and shipped with its certificate, or reserved as the centre stone for one of our rings. If set into a ring, the design moves through CAD, a silver or wax sample for try-on at our Hatton Garden showroom, casting, setting, polishing and London Assay Office hallmarking — typically 7 to 14 working days depending on complexity. Oval lab grown diamonds suit solitaires, hidden halos, three-stone settings and east-west orientations particularly well. Loose-stone purchases carry 30 days to return with no exclusions; rings carry a lifetime warranty and free resizing for life.