Laboratory-grown green diamond

The green diamond is one of the most coveted fancy colors in the world of gemology. Its hue evokes nature, exclusivity, and rarity. In nature, green diamonds acquire their color after millions of years of exposure to gamma radiation from radioactive minerals in the soil. The result is a color predominantly distributed on the stone's surface, not in its depth, which makes it extremely scarce and difficult to certify.

In the laboratory, the process of obtaining the green color is replicated in a controlled and traceable manner. Diamonds undergo irradiation treatments and, in some cases, annealing processes that stabilize and deepen the color. The result is a diamond with the same physical and chemical properties as a natural one, but with an intense, homogeneous, and verifiable green color. No dubious provenance. No environmental impact.

Why choose a laboratory-grown green diamond

Natural colored diamonds are rare. Green ones, even more so. An intense natural green diamond can cost tens of thousands of euros per carat. A laboratory-grown green diamond offers the same visual impact, the same physical properties, and the same hardness, 10 on the Mohs scale, at a fraction of the price.

But the argument is not only economic. Each diamond in our collection is traceable from its origin: we know exactly how it was created, what color process was applied, and what certificate accompanies it. No mines. No geopolitical conflicts. No ambiguity in the supply chain. For the buyer who values both aesthetics and ethics, the laboratory-grown green diamond is the most coherent choice.

How the green color is formed in a laboratory-grown diamond

In natural diamonds, the green color appears when the carbon's crystalline structure is altered by ionizing radiation, creating defects in the crystal lattice that absorb certain wavelengths of light and reflect the green spectrum. This process takes millions of years and is impossible to control.

In the laboratory, diamonds are first created using CVD (Chemical Vapor Deposition) or HPHT (High Pressure High Temperature) technology to obtain a high-quality colorless base. Subsequently, they undergo a high-energy irradiation treatment, using particle accelerators or controlled nuclear reactors, which generates the same defects in the crystal lattice as in nature. In some cases, an additional annealing process is applied which modifies the color distribution, shifting it towards warmer (yellow-green) or deeper (intense green) tones.

The result is a permanent, stable, and certifiable color. It is not a surface coating or a temporary treatment: the color is in the diamond's structure.

The 4Cs in laboratory-grown green diamonds

Color

Color is the most important criterion in a fancy green diamond. The grading scale ranges from Faint to Fancy Vivid, with Fancy Intense and Fancy Vivid being the grades that offer the greatest saturation and, therefore, the greatest visual impact. Nuances also matter: a pure green is more valued than a yellow-green or a blue-green, although the latter also have their own admirers. In the laboratory, we can access the full range of shades with much more consistency than in nature.

Cut

In colored diamonds, the cut is optimized to maximize visible saturation, not to maximize brilliance as in colorless diamonds. Radiant, cushion, and oval cuts are the most commonly used because they allow the color to be concentrated in the center of the stone. The round brilliant cut, although technically producing more brilliance, can dilute the saturation. In our collection, you will find different cut options adapted to each jewelry style.

Clarity

In colored diamonds, clarity is less important than in colorless ones. From SI1, the human eye does not distinguish inclusions in most sizes. For green diamonds, we recommend clarities higher than VS1: they offer an eye-clean stone with excellent value for money. If color is the protagonist, investing in higher clarities yields minimal visual return.

Carat Weight

Laboratory-grown green diamonds are available from 0.30 carats upwards. For the color to be truly visible and have an impact in a piece of jewelry, we recommend starting from 1.50 carats. From 1.5 carats, the fancy green color becomes the dominant element of any design. The absence of size restrictions imposed by natural scarcity allows access to large stones without the exponential additional cost of the natural diamond market.

Certification of laboratory-grown green diamonds

All diamonds in our collection are certified by IGI (International Gemological Institute), the world's leading gemological laboratory for laboratory-grown diamonds. The IGI certificate documents the 4Cs, the origin (laboratory), the creation process (CVD or HPHT), and, in the case of colored diamonds, the treatment applied to obtain the color.

It is essential that any green diamond, natural or laboratory-grown, comes with a gemological certificate. Without it, there is no way to verify the quality of the color or the origin of the treatment. At Diamante de Laboratorio, every stone we sell includes its downloadable IGI certificate, with all verifiable data online on the IGI website.

How to choose the ideal green diamond for your jewelry

The choice of a green diamond depends primarily on its final use. For a solitaire ring, prioritize color (Fancy Intense or Fancy Vivid) and cut (radiant or oval for greater saturation). For paired earrings, color consistency between the two stones is key: in the laboratory, it is much easier to find matched pairs than in the natural market. For a pendant or a color pavé, smaller cuts with Fancy colors offer exceptional results without needing to reach Fancy Vivid.

If you have doubts about which stone best suits your jewelry project, at Diamantes de Laboratorio we can advise you. We work directly with certified suppliers and have access to a wide inventory of laboratory-grown green diamonds in different cuts, sizes, and color gradings. With no purchase obligation.