Diamonds GIA
GIA-certified lab-grown diamonds: the ultimate international guarantee in purity, cut, and authenticity. Discover our collection and choose with complete confidence.
Selection of lab-grown diamonds
Selection of laboratory diamonds
What are GIA certified diamonds
The GIA (Gemological Institute of America) is the world's most recognized gemological certification body.
Founded in 1931, it established the 4Cs system now used by leading laboratories in the industry: color, clarity, cut, and carat.
A GIA-certified diamond includes a gemological report that independently documents its physical and optical characteristics.
Since 2019, GIA also certifies laboratory-grown diamonds, applying rigorous scientific criteria to verify their authenticity and gemological characteristics.
At Diamante de Laboratorio, all GIA diamonds in our collection include their original report with a verifiable reference number in the institute's official database.
Why choose a laboratory-grown diamond with GIA certification
GIA certification provides three fundamental guarantees:
- Independence: the report is issued by an external body with no commercial relationship with manufacturers or sellers.
- Traceability: each diamond incorporates a unique number laser-inscribed on the girdle of the stone.
- International Standard: evaluations follow recognized and comparable criteria in any market worldwide.
The report number can be verified directly on the GIA's public database, providing an additional layer of security and authenticity.
Furthermore, GIA-certified laboratory-grown diamonds can cost more than 80% less than an equivalent natural diamond, while maintaining the same physical, chemical, and optical properties.
They share the same hardness of 10 on the Mohs scale, the same refractive index, and the same characteristic brilliance of a diamond.
How GIA-certified laboratory-grown diamonds are created
GIA certifies diamonds produced using the two recognized industrial methods:
- CVD (Chemical Vapor Deposition)
- HPHT (High Pressure High Temperature)
In the CVD process, a carbon-rich gas is introduced into a sealed chamber where carbon is deposited layer by layer onto a crystalline seed until the diamond is formed.
The HPHT method reproduces the extreme conditions inside the Earth using temperatures above 1,400 °C and pressures above 5 GPa.
Both systems produce diamonds that are chemically pure and structurally identical to natural ones.
GIA verifies these characteristics using advanced spectroscopy and other instrumental analyses before issuing the corresponding report.
The 4Cs of a GIA diamond
Color
GIA classifies the color of colorless diamonds on a scale ranging from D (totally colorless) to Z (with perceptible hues).
In our collection, the most common ranges are between D and H.
Grades D, E, and F are colorless, while G and H are near-colorless and present practically imperceptible differences once mounted in jewelry.
Clarity
The GIA clarity scale comprises eleven grades, from FL (Flawless) to I3.
For fine jewelry, a minimum clarity of VS2 usually ensures that inclusions are not visible to the naked eye.
The diamonds in our collection start from VS2 as the minimum quality standard.
Cut
The cut determines how the diamond interacts with light and directly affects the stone's brilliance, fire, and scintillation.
GIA classifies cut into five categories:
- Excellent
- Very Good
- Good
- Fair
- Poor
An Excellent cut allows for maximum optical performance from the diamond.
Carat
Carat (ct) is the unit of weight used for diamonds.
1 carat equals 0.2 grams, and GIA performs measurements with four decimal place precision.
In our collection, you will find diamonds from 0.30 ct to stones over 3 ct, adapted to different designs and needs.
GIA certification for laboratory-grown diamonds
The Gemological Institute of America (GIA) continues to certify laboratory-grown diamonds through specific reports for laboratory-grown diamonds.
However, it has recently changed the way it classifies some of these diamonds.
Traditionally, GIA used the same detailed color and clarity classification for laboratory-grown diamonds as for natural diamonds, assigning specific grades such as D, E, F or VS1, VVS2.
Currently, for many laboratory-grown diamonds, GIA has evolved towards an approach that prioritizes the overall assessment of the stone's visual and gemological quality.
This adaptation responds to the technological evolution of the industry, where many modern laboratory-grown diamonds exhibit very high and homogeneous levels of color and purity.
Therefore, current reports place special emphasis on:
- The authenticity of the diamond
- Its laboratory-grown origin
- The growth method (CVD or HPHT)
- Measurements and proportions
- Cut quality and finish
- Possible treatments or relevant characteristics
This does not imply a reduction in the level of gemological control, but rather an adaptation to a market where the visual differences between many technical grades are increasingly smaller.
The report number continues to be laser-inscribed on the diamond's girdle and can be verified directly on the official GIA website.
At Diamante de Laboratorio, we work with GIA and IGI certifications, always selecting stones with excellent visual performance, brilliance, proportions, and cut quality.
How to choose your GIA diamond
The way laboratory-grown diamonds are selected has evolved significantly in recent years.
Today, rather than pursuing minimal differences between technical grades, it is more useful to evaluate the actual visual behavior of the stone.
The factors that most influence the final result are:
Cut and proportions
The cut is the element that most determines the diamond's appearance once mounted.
Brilliance, light dispersion, and visual size primarily depend on:
- Proportions
- Symmetry
- Depth
- Visible diameter
Actual visual appearance
Most current laboratory-grown diamonds already exhibit very high levels of color and cleanliness.
Therefore, we recommend paying special attention to:
- Response to light
- Transparency
- Brilliance
- Overall visual presence
Visual size versus technical weight
Carat weight does not always determine how a stone is perceived.
Two diamonds with the same weight can offer very different appearances depending on their proportions and the quality of their cut.
A well-proportioned diamond can appear visually larger and more brilliant than one with greater weight but a less efficient structure.
FAQs about GIA-Certified Lab-Grown Diamonds
Yes. GIA certifies lab-grown diamonds as real diamonds. They have the same chemical composition (pure carbon in a cubic crystalline structure), the same hardness of 10 Mohs, and the same optical properties as mined diamonds. The only difference is their origin.
Both GIA and IGI are internationally recognized gemological laboratories used in the certification of lab-grown diamonds.
The GIA (Gemological Institute of America) is the institute that developed the international diamond grading system known as the 4Cs and remains one of the most important historical references in the industry.
The IGI (International Gemological Institute), for its part, has become one of the bodies with the greatest presence and specialization in the lab-grown diamond market, currently being one of the most widely used certificates internationally in this segment.
In recent years, both laboratories' approach to lab-grown diamonds has evolved. While IGI continues to use a traditional detailed classification (color, clarity, cut, etc.), GIA has begun to adapt its evaluation system to the current reality of the lab-grown market, where a large proportion of diamonds exhibit very high and homogeneous levels of quality.
In both cases, the certificate guarantees fundamental aspects such as:
• diamond authenticity
• lab-grown origin
• measurements and proportions
• gemological characteristics
• possible treatments
• and report traceability through laser inscription on the girdle
Beyond the laboratory, what is truly important is the actual visual quality of the diamond and the selection of the stone. That's why, at Diamante de Laboratorio, we only work with carefully selected diamonds in excellent visual ranges.
The second-hand market for laboratory-grown diamonds, like that of any consumer good, has its own dynamics. GIA certification provides traceability and guarantees the characteristics, which facilitates any future transaction.
Yes. At Diamante de Laboratorio, you can select the GIA diamond from the collection and combine it with the jewelry design you prefer. Shipping takes less than 12 days.
The collection includes the most in-demand cuts: brilliant round, princess, emerald, oval, pear, cushion, and marquise, among others. Each with its corresponding GIA report.
