Lab-grown diamonds with heart cut

The heart cut is one of the most expressive shapes in gemology. It is a diamond cut in the shape of a symmetrical heart, derived from the brilliant round cut, with between 56 and 58 facets distributed to maximize brilliance and light dispersion.

The cut requires a high degree of precision: the top curve, the central cleft, and the two lobes must be perfectly symmetrical for the silhouette to be recognizable and the diamond to sparkle uniformly.

In the conventional market, the heart cut is uncommon precisely because of the difficulty of its cutting.

At Laboratorio Diamonds, we work with cuts that meet the symmetry standards required by this cut, so that the heart is clearly visible both to the naked eye and under magnification.

Why choose a heart-cut lab-grown diamond

A heart-cut lab-grown diamond offers exactly the same optical and physical properties as a natural diamond with the same cut: the same hardness, the same refractive index, and the same light dispersion capability.

The difference lies in the origin: created in a controlled chamber using the CVD or HPHT process, without mining extraction.

This translates into three specific advantages:

• Significantly lower price per carat than an equivalent natural diamond.
• Full traceability from creation to certification.
• Lower environmental and social impact compared to conventional mining.

How the heart cut is created in a lab-grown diamond

The process begins with the production of the rough diamond using CVD or HPHT.

In CVD, carbon is deposited layer by layer onto a substrate in a vacuum chamber, replicating formation conditions at an atomic scale.

HPHT replicates the pressures and temperatures of the Earth's mantle.

Once the rough crystal is obtained, the cutter analyzes the optimal orientation of the material and performs the bruting, girdling, and polishing of the facets with micrometric precision.

The heart cut requires special attention to the symmetry of the vertical axis: any deviation causes the shape to appear distorted.

That is why this type of cut is only offered when the final result meets the minimum criteria required by certification laboratories.

The 4Cs of the lab-grown heart diamond

The 4Cs take on a particular dimension in the heart cut, because the visibility of inclusions and the distribution of color are more evident than in other cuts.

Color

For the heart cut, it is recommended to start from grades D to H on the GIA scale.

The heart cut retains more color at the ends of the lobes and at the bottom point. From grade I, the yellowish tint can become perceptible, especially in diamonds larger than 1 carat.

Clarity

A range between FL and VVS2 ensures that the diamond is eye-clean, meaning that inclusions are not visible to the naked eye.

In the heart cut, inclusions located below the table can be more visible than in other types of cuts.

Carat Weight

The heart cut has a larger face-up proportion than the round for the same weight, meaning that a 1 ct heart diamond can appear larger than a round diamond of the same carat weight.

The shape is properly appreciated from 1.00 ct. Below that weight, the silhouette may not be recognizable to the naked eye.

For engagement rings, the most requested weights are between 2.50 ct and 6.00 ct.

Cut and Symmetry

This is the most critical parameter in the heart cut.

The two upper lobes must be equal, the central cleft must be well-defined, and the bottom point must be sharp and centered.

In the IGI certificate, this factor is reflected in the symmetry and finish fields. We only recommend cuts with Excellent symmetry.

IGI Certification for the Heart Cut

All heart-cut lab-grown diamonds in our collection are certified by the IGI (International Gemological Institute).

The report includes the grade of each of the 4Cs, the exact carat weight, the stone's dimensions, symmetry, polish, and fluorescence.

The IGI certificate guarantees that the diamond has been evaluated by an independent third party.

Before purchasing, we recommend reviewing the full report and especially the inclusion diagram, where the location is particularly relevant in this type of cut.

How to choose your heart-cut lab-grown diamond

• Define the carat weight range: the shape is properly appreciated from 1.00 ct and gains presence from 1.50 ct.
• Prioritize symmetry: always check the symmetry field of the IGI certificate and choose Excellent.
• Consider the setting: prong or halo settings help protect the bottom point of the heart.
• Adjust color to size: the larger the carat weight, the more visible the color. For stones of 1 ct or more, we recommend D-E grades.