Heart-Shaped Lab-Grown Diamonds

The two upper curves are called lobes, and the indentation between them is the cleft. Together with the lower point, they give the diamond its recognisable shape.

View the diamond directly from above and imagine a vertical line through its centre. Compare the left and right halves, paying attention to the height of the lobes and how evenly the sides taper towards the point. GIA identifies matching halves and a clearly defined outline as important selection considerations. GIA’s heart-shaped diamond guide.

Use a straight-on photograph for this comparison. An angled image can make one side appear larger, so request another view before judging an apparent imbalance.

Some hearts have a broad outline; others look taller and narrower. Length-to-width ratio helps describe this difference, but it does not establish whether a diamond is well cut.

For a heart shape, length runs from the lower point to an imaginary line across the tops of the lobes. Width is measured across the widest part. A ratio around 1.00 indicates similar length and width; compare the photograph alongside the measurements to decide which outline you prefer. GIA’s guidance on heart-shaped gemstone proportions.

Carat weight measures weight, so two hearts with the same carat weight can have different visible dimensions. Check the measurements in millimetres when comparing how much space each diamond will occupy in a ring, pendant or earring. IGI’s guide to the diamond 4Cs.

Ask to see shortlisted diamonds at a comparable scale. Large product images are useful for inspecting detail, but also consider how clearly you can recognise the heart when viewing the proposed jewellery at an everyday distance.

A balanced outline deserves a closer look at the diamond’s light performance. Request a video showing gentle movement and, where possible, views under more than one lighting condition.

Watch the centre and both lobes. Notice whether bright and dark areas change as the diamond moves, and whether any broad area remains distracting across several views. Heart-shaped brilliant cuts can show a bow-tie-like dark area; its prominence matters more than the label alone. GIA’s advice on assessing heart-shaped gems.

Avoid choosing solely from a table or depth percentage. IGI explains that fancy-shape cut assessment considers proportions alongside polish, symmetry, craftsmanship and light return. Proportions alone cannot establish cut quality, and Excellent polish and symmetry are not automatically an Excellent overall cut grade. IGI’s fancy-shape cut-grading process.

Use colour and clarity grades to organise your shortlist, then compare the stones themselves. There is no single grade combination that suits every budget, diamond size and jewellery design.

For colour, request comparable views against a neutral background. When choosing a centre stone for jewellery with other diamonds, ask to see the stones together before deciding whether their appearance works for you.

For clarity, examine the central viewing area and ask about any noticeable characteristics near the point or outer edge. A magnified image helps locate a feature, but a qualified assessment is needed to judge whether it affects durability.

IGI assesses clarity at 10× magnification and considers factors including the size, number, location and nature of characteristics. The grade therefore needs to be read alongside the individual diamond’s images and report. IGI’s explanation of laboratory-grown diamond grading.

A heart-shaped diamond needs a setting that secures the stone while keeping its distinctive outline visible.

Pay particular attention to the lower point. GIA identifies this as the part of a heart-shaped diamond most vulnerable to damage and recommends a setting that shields it. GIA’s heart-shaped diamond setting advice.

The upper prongs also influence the appearance. Metal that obscures the cleft can make the heart harder to recognise. GIA recommends positioning prongs on the lobes, rather than in the cleft, to emphasise the shape. GIA’s diamond shape and setting guide.

Ask the jeweller to assess the actual diamond’s dimensions and outline before confirming the setting. In a design preview, check both the tip coverage and how much of the upper curves remains visible.

Before choosing a loose heart-shaped lab-grown diamond, review its grading report. Confirm the laboratory-grown identification, shape, measurements, carat weight, colour and clarity, along with the available finish and cut assessments.

For a stone with an IGI report, check the report number through IGI’s verification service and ask for the physical diamond to be matched to its documentation, including its inscription where present. An online report lookup verifies the record; matching the stone to that record is a separate step. IGI’s laboratory-grown diamond report information.

Our IGI-certified lab-grown diamond guide explains report considerations in more detail.

When requesting a quote, include the stock reference or report number, your preferred dimensions and the intended jewellery design. Confirm whether the quote covers the loose diamond alone or also includes the setting, applicable taxes and delivery. For broader pricing information, explore our lab-grown diamond price guide.

Ready to compare suitable stones? Contact Uniglo Diamonds with your preferred size, budget and intended jewellery design to ask about current options.

You can also browse the lab-grown diamond inventory and include any relevant stock references in your enquiry.