What is a Lab-Grown Diamond? Complete Guide | Diamelys
What is a lab-grown diamond?
Introduction
In recent years, lab-grown diamonds have progressively established themselves in the jewelry world. However, many questions remain:
- Is it a real diamond?
- Is it as strong as a natural diamond?
- How is it made?
- Why is it more accessible?
At Diamelys, we believe that a jewelry purchase should always be accompanied by clear and transparent information. Here's everything you need to know about lab-grown diamonds.
Is a lab-grown diamond a real diamond?
Yes.
Unlike an imitation such as cubic zirconia or moissanite, a lab-grown diamond is a real diamond.
It has the same chemical composition as a natural diamond: crystallized carbon. It also exhibits the same physical and optical properties, including exceptional hardness, brilliance, and light reflection.
To the naked eye, it is impossible to distinguish a natural diamond from a lab-grown diamond.
What else are lab-grown diamonds called?
The most common term is lab-grown diamond. The expressions laboratory-grown diamond or lab-created diamond are also used.
In French, several terms are used:
- diamant de laboratoire (lab-grown diamond)
- diamant cultivé en laboratoire (laboratory-grown diamond)
- diamant créé en laboratoire (lab-created diamond)
- diamant de synthèse (synthetic diamond)
- diamant synthétique (synthetic diamond)
At Diamelys, we prefer the term diamant de laboratoire (lab-grown diamond) because it is clear, educational, and easy to understand. However, it is important to specify that a lab-grown diamond is not an imitation: it is a real diamond, chemically identical to a natural diamond. The IGI states that lab-grown diamonds are chemically identical to natural diamonds and are neither fakes nor simulants.
How is a lab-grown diamond created?
A lab-grown diamond is created from a diamond seed. This small diamond fragment serves as the basis for crystal growth.
Today, two main technologies are used: HPHT and CVD.
The HPHT method
HPHT stands for High Pressure High Temperature.
This method replicates the extreme conditions under which natural diamonds form beneath the Earth's surface. Carbon is placed in a specially designed press, subjected to very high pressure and a temperature of approximately 1,300 to 1,600 °C. Under these conditions, carbon atoms gradually crystallize around the diamond seed. The GIA describes the HPHT process as a method that subjects carbon to extreme temperatures and pressures to replicate the natural diamond formation conditions.
After this growth phase, the rough crystal is then cut and polished like a natural diamond.
The CVD method
CVD stands for Chemical Vapor Deposition.
In this process, the diamond seed is placed in a vacuum chamber containing a carbon-rich gas, often methane mixed with hydrogen. An energy source, such as microwaves, transforms this gas into plasma. Carbon atoms then deposit layer by layer on the diamond seed, until a crystal is formed. According to the GIA, the CVD method uses a vacuum chamber, a carbon-containing gas, and gradual crystallization on a synthetic diamond plate.
Growth can last from several days to several weeks, depending on the desired size, the technology used, and the production parameters.
Why are lab-grown diamonds more accessible?
The cost of a lab-grown diamond is generally lower than that of a natural diamond of equivalent quality.
This difference is mainly explained by their production method and a more controlled supply chain. For many customers, this allows access to a larger or higher quality diamond for the same budget.
How much electricity does it take to produce a one-carat lab-grown diamond?
There is no single figure valid for all lab-grown diamonds.
Electricity consumption depends on several factors:
- the method used: HPHT or CVD;
- the efficiency of the machines;
- the growth duration;
- the number of crystals produced in the same chamber;
- the electricity source used;
- whether we are talking about a rough carat or a cut and polished carat.
A study published in the journal Energies estimates that a modern HPHT process can consume approximately 36 kWh per rough carat under certain conditions, while some CVD processes can vary significantly, for example around 77 to 215 kWh per carat depending on the facilities studied.
It is therefore more accurate to say that: the production of a lab-grown diamond requires energy, and its environmental impact depends heavily on production efficiency and the origin of the electricity used.
Are lab-grown diamonds certified?
Absolutely.
Like natural diamonds, lab-grown diamonds can be evaluated and certified by independent gemological organizations.
At Diamelys, we particularly favor IGI (International Gemological Institute) and GRC certifications, which detail the diamond's characteristics: weight, color, clarity, proportions, and cut quality.
This certification allows customers to compare stones objectively and transparently.
Why did Diamelys choose lab-grown diamonds?
At Diamelys, we believe that a precious jewel should primarily be chosen for its beauty, quality, and the emotion it evokes.
Lab-grown diamonds now make it possible to offer:
- high-quality certified diamonds;
- more freedom in carat weight choice;
- excellent value for money;
- contemporary jewelry adapted to the expectations of new generations.
Each diamond is carefully selected and accompanied by its certificate of authenticity to ensure complete transparency.
FAQ
Does a lab-grown diamond lose its brilliance?
No. Its physical properties are identical to those of a natural diamond. It retains its brilliance over time.
Can you tell the difference with the naked eye?
No. Only specialized equipment can identify its origin.
Are lab-grown diamonds certified?
Yes. They can be certified by recognized laboratories such as the IGI.
Are they suitable for an engagement ring?
Of course. Their durability and resistance are perfectly suited for daily wear.
