What is a lab-grown diamond
A lab-grown diamond is an authentic diamond, with the same carbon composition, hardness, and brilliance as a mined diamond. The only difference is its origin: instead of forming under the Earth's crust over millions of years, it crystallizes in a matter of weeks in a controlled environment that replicates the necessary pressure, temperature, or chemical conditions. At Diamante de Laboratorio, we work exclusively with stones created using the high-pressure, high-temperature and chemical vapor deposition methods, all with independent gemological certification, for both individuals and jewelers looking for a specialized supplier.
What is a lab-grown diamond , in gemological terms
A lab-grown diamond is pure carbon crystallized in a cubic structure, exactly like a natural diamond. International gemology classifies it as a diamond for all intents and purposes, not as an imitation: under a microscope, a jeweler's loupe, or a standard thermal test, both respond in the same way. The technical term "synthetic" that appears in some reports does not mean artificial in a pejorative sense; it only describes that its growth occurred in a controlled reactor and not in a mine. The U.S. Federal Trade Commission updated its official definition in 2018 precisely to recognize that a laboratory-created diamond is, unequivocally, a diamond.
How lab-grown diamonds are made
There are two established technologies for creating a lab-grown diamond. Both start with a diamond carbon "seed" and reproduce, through different methods, the conditions that nature takes millions of years to complete. The result is the same pure carbon crystal, but the process, the time, and the type of stone obtained differ.
Method high pressure and high temperature
High pressure and high temperature simulate the conditions of the Earth's mantle. The seed is introduced into a chamber along with a metal catalyst and subjected to pressures of more than 5 GPa and temperatures above 1,300 °C. The carbon dissolves and redeposits layer by layer on the seed, forming a new crystal in a few weeks. It is the oldest method and is historically associated with yellow or brown stones, although with current technology, high-quality colorless diamonds are also obtained, and it is frequently used to improve the color of already formed crystals.
Chemical vapor deposition
La deposición química en fase de vapor trabaja a una presión mucho más baja, en una cámara donde se inyecta un gas rico en carbono, normalmente metano, junto con hidrógeno. La mezcla se calienta hasta convertirse en plasma; los átomos de carbono se separan y se depositan sobre la semilla en capas atómicas. Este método se ha popularizado en la última década porque permite controlar con mucha precisión la pureza del diamante final y obtener piedras incoloras de alta gama, ideales para joyería.
En el catálogo de Diamante de Laboratorio encontrarás todo tipo de piedras, fabricadas con ambos métodos. Ambos métodos son certificados, de modo que la decisión final puede tomarse en función del informe gemológico, no del proceso de origen.
Lab-Grown Diamonds vs. Mined Diamonds
Both options share the essentials: they are authentic diamonds of crystallized carbon, with the same hardness on the Mohs scale, the same refractive index, and the same reaction to any standard gemological test. What distinguishes one stone from another is not its nature, but its origin, its traceability, its impact, and consequently, its price.
| Criterio | Diamante de laboratorio | Diamante de mina |
|---|---|---|
| Composición | Carbono puro cristalizado | Carbono puro cristalizado |
| Propiedades físicas y ópticas | Iguales en dureza, brillo y refracción | Iguales en dureza, brillo y refracción |
| Origen | Crecido en reactor de alta presión y alta temperatura o mediante deposición química en fase vapor | Formado en el manto terrestre durante millones de años |
| Trazabilidad | Total: reactor, método y fecha | Parcial: depende de la cadena de extracción |
| Certificación | Laboratorio gemológico reconocido, instituto gemológico internacional u otros laboratorios independientes | Laboratorio gemológico reconocido, instituto gemológico internacional u otros laboratorios independientes |
| Impacto ambiental | Menor impacto asociado a la minería tradicional | Implica extracción, transporte y procesado de roca |
| Precio orientativo | Hasta más de un 80% más económicos a igual calidad | Condicionado por la cadena minera |
| Diferencia visible a simple vista | Ninguna | Ninguna |
Are lab-grown diamonds real?
Yes. A lab-grown diamond is a real diamond, not an imitation like cubic zirconia or moissanite. It shares the chemical formula (C), crystal structure (cubic), and maximum hardness on the Mohs scale with any diamond mined from the earth. No standard gemological jewelry test identifies it as a material other than natural diamond; it can only be distinguished by specialized equipment capable of reading the crystal’s growth pattern.
Most frequently asked questions:
- “Isn't it a crystal or glass?" No. The atomic structure is that of a diamond; glass would scratch as soon as it came into contact with any hard stone.
- "Does it wear out faster than a mined diamond?" No. The hardness is the same, as is the resistance to daily wear in jewelry.
- "Does it lose its sparkle over time?" No more than a mined diamond. The sparkle depends on the cut and clarity, not the origin.
- "Is it always perfect because it comes from a laboratory?" Not necessarily. Each stone has its own color and clarity; that's why certification is essential.
In 2018, the US Federal Trade Commission removed the word "natural" from the official definition of diamond, recognizing that a lab-created diamond is, legally speaking, also a diamond.
How much does a lab-grown diamond cost
There is no single price: it costs the same as any other diamond of comparable gemology, but significantly less than a mined diamond with the same characteristics.
The final price is determined by the universal 4Cs:
- Carat: For the same color and clarity, the stone becomes more expensive non-linearly as the carat weight increases.
- Color: The D-Z scale penalizes the presence of yellow tones. A D, E, or F (colorless) diamond has a higher price than a G-J.
- Clarity: The absence of visible inclusions is valued. Clarity influences the price and should be assessed along with the other characteristics.
- Cut: The geometry of the cut determines how much light the stone returns. An excellent cut can maintain the price even with slightly lower color or clarity.
In addition to this, there is certification. A stone with a recognized gemological laboratory report is usually priced slightly higher than the same stone with a report from the International Gemological Institute, not because it is different, but because of the brand recognition of the laboratory.
GIA and IGI Certification on Lab Grown Diamonds
The certificate is the technical guarantee of the stone. All Laboratory Grown Diamonds come with a report from an independent gemological laboratory, where their actual characteristics are recorded and their laboratory origin is stated.
The two most common certificates are GIA and IGI. Both allow you to check key data before buying: cut, color, clarity, carat weight, growth method, and report number. This helps to compare stones with criteria and avoids choosing solely by price or appearance.
In the report, it is especially important to check:
- The shape and cut, including cut, polish, and symmetry.
- The color and clarity.
- The carat weight.
- The growth method: HPHT or CVD.
- The report number, which allows you to verify the stone on the laboratory's website.
Which Lab Grown Diamond to choose according to your goal
The interesting question is not whether it's lab-grown or mined, but what you want the diamond for. The criteria change depending on its intended use.
If you are buying as an individual for a personal piece of jewelry or an engagement ring, prioritize the cut and the balance between color and clarity within your budget. A lab-grown diamond allows you to increase the carat weight or color without significantly increasing the cost, while still maintaining independent certification. If you later need it set in a specific piece, we can refer you to The Bright Club, our sister jewelry store.
If you are buying as a professional jeweler, you need an extensive catalog, documented traceability for each piece, and a direct supply channel. This is what the professional area is for, with specific conditions, lead times, and support for jewelry stores.
Frequently Asked Questions About Lab Grown Diamonds
A lab-grown diamond is a genuine diamond of pure carbon crystallized in a cubic structure, identical in composition, hardness, and brilliance to a mined diamond. The only difference is that it forms in a matter of weeks inside a reactor that reproduces the necessary conditions, instead of over millions of years under the Earth's crust. International gemology, including the US Federal Trade Commission since 2018, recognizes it as a full-fledged diamond, not an imitation. Each piece can be certified in recognized gemological laboratories with the same rigor as a natural diamond.
There are two technologies. High-pressure, high-temperature technology subjects a carbon seed to pressures above 5 GPa and temperatures above 1,300 °C, simulating the Earth's mantle. Chemical vapor deposition works at low pressure: it introduces a carbon-rich gas, usually methane with hydrogen, converts it into plasma, and allows the carbon atoms to deposit layer by layer onto the seed. Both methods produce diamonds of very high gemological quality; high-pressure, high-temperature typically yields better value for money in larger stones, and chemical vapor deposition excels when extreme purity and colorless stones are desired.
Given the same 4Cs (cut, color, clarity, and carat weight), a lab-grown diamond typically costs up to 80% less than an equivalent natural diamond. The difference is not due to lower quality, but to a shorter value chain, without mining costs or traditional intermediation. The specific final price always depends on the combination of the 4Cs and the chosen certification (recognized gemological laboratories). The realistic way to compare is to see actual pieces with their certificates side-by-side, not to apply generic tables.
They are real. A lab-grown diamond shares the same chemical formula, crystalline structure, and maximum hardness as any natural diamond, whereas cubic zirconia or moissanite are different materials with different properties. A jeweler with standard tools cannot distinguish a lab-grown diamond from a mined diamond with the naked eye; specific gemological equipment is needed to detect the growth pattern. This is why reports from recognized gemological laboratories are so important: they guarantee, in writing, what type of stone you are buying and its exact characteristics.
Yes, in comparative terms. Creating a diamond in a reactor avoids the extraction and displacement of tons of rock, as well as the social and environmental externalities associated with the traditional mining chain. This does not mean zero impact: any industrial process consumes energy and resources. We are talking about a lower impact compared to traditional mining and a more responsible option, especially when the energy used comes from renewable sources, not an absolute seal of sustainability. Full traceability of origin is, in itself, an advance compared to the classic mining model.
It is reasonable to always demand a report from an independent gemological laboratory, ideally from recognized gemological laboratories. The certificate must include cut (with polish and symmetry), color on a D-Z scale, clarity on an FL-I scale, carat weight with precision to the hundredth, growth method (high pressure and high temperature or chemical vapor deposition), and, if applicable, any subsequent treatments. The report number allows direct verification of the stone on the laboratory's website. If a stone is sold without a certificate, there is no objective way to know what you are buying, and it is advisable to be wary.
