Heart Lab Grown Diamonds

What is a heart lab grown diamond?

A heart lab grown diamond is a brilliant-cut stone grown in a controlled laboratory environment and then hand-faceted into a symmetrical heart outline — the same carbon crystal structure as a mined diamond, produced without open-cast extraction. The heart shape is a modified brilliant, typically carrying 56 to 59 facets arranged to draw light through two rounded lobes and a pointed culet. Because the shape is optically demanding — any asymmetry between the left and right lobes is immediately visible — cut precision matters more here than with many other fancy shapes. Lab grown production allows cutters to work from a larger, inclusion-free rough than is often available in mined parcels, which can favour the tight symmetry a well-cut heart requires. The result is a stone that reads as a recognisable silhouette without sacrificing the light return associated with round or cushion brilliants.

Choosing the right length-to-width ratio for a heart lab grown diamond

For heart lab grown diamonds, a length-to-width ratio between 0.95 and 1.05 produces the most balanced silhouette — lobes of equal width, a clean cleft, and a pointed base that sits centrally in its setting. Ratios below 0.90 produce a wide, squat heart that can look indistinct at smaller carat weights; ratios above 1.10 create a narrow, elongated outline that may suit a longer finger but tends to lose the characteristic heart read. At weights of 0.5ct and below, the shape outline can compress significantly, so a higher colour grade — typically G or above — and a cleaner clarity grade help maintain visual definition. From 0.75ct upwards, the heart silhouette becomes self-evident and allows slightly more flexibility on colour. When set into a ring, a bezel or three-claw setting that follows the heart's outline preserves the shape best; a four-claw prong arrangement at the two lobes, cleft, and point is the most common choice.

How do heart lab grown diamonds compare on price?

Heart lab grown diamonds are priced meaningfully below equivalent mined stones of the same carat weight, colour, and clarity — the per-carat premium for a natural heart diamond reflects both rarity and the cost of extraction that lab production bypasses. As a fancy shape, the heart also tends to be cut from rough that would otherwise yield waste, meaning carat-for-carat it can offer more visible size than a round brilliant of the same stated weight. For buyers working within a fixed budget, a lab grown heart diamond can deliver a noticeably larger or better-specified stone than a natural equivalent at the same spend. Bridebook's 2026 UK average engagement ring spend of £2,247 gives a useful anchor, and a certified heart lab grown diamond in the 0.75ct to 1.0ct range with VS2 clarity and G colour sits comfortably within or around that figure when bought loose. When set into one of our rings, the full ring cost will depend on metal choice and setting complexity.

Are heart lab grown diamonds certified to the same standard as natural diamonds?

Every heart lab grown diamond in this collection is certified by GIA, HRD or IGI — the same internationally recognised laboratories that grade natural diamonds. The certificate records the stone's carat weight, colour grade, clarity grade, cut grade, and fluorescence; for a heart shape, the grading report will also note symmetry and polish, both of which are critical to the shape's visual balance. Lab grown origin is disclosed on the certificate, as required by all three laboratories. The carbon crystal lattice of a lab grown diamond is physically and chemically identical to a mined stone, and the grading criteria applied are unchanged. When a loose heart lab grown diamond is subsequently set into one of our rings, the finished piece is hallmarked at the London Assay Office.

Caring for a heart lab grown diamond

A heart lab grown diamond shares the hardness of any diamond — 10 on the Mohs scale — and will not scratch under normal wear. The two points of vulnerability specific to the heart shape are the pointed culet at the base and the cleft between the two lobes; both are thin sections of stone where a sharp lateral impact can cause chipping. A setting that protects the point with a V-shaped or bezel prong significantly reduces this risk. For cleaning, warm water with a small amount of mild detergent and a soft brush is sufficient; ultrasonic cleaners are safe for diamonds but should be used with caution if the setting includes softer accent stones. Periodic checks of the prongs — particularly those at the cleft and point — are advisable, and our rings carry a lifetime warranty that covers workmanship.