Each IQ Diamonds stone is accompanied by a Certificate of Conformity. This document confirms the uniqueness of the brand and the accuracy of the specified parameters: purity, shape, cut quality, color, weight and distinctive features of the diamond.

Such a passport significantly increases the value of the stone, turning the diamond into an excellent investment.

IQ Diamonds are certified by non-profit organizations:

The laboratories certify only non-etched natural and lab-grown diamonds from 0.3 carats.

Examples of certificates

GIA certificate

GIA certificateGemological Institute
of America – GIA

IGI certificate

IGI certificateGerman Laboratory-IGI

МГУ certificate

МГУ certificateGemstone Certification

MGL certificate

MGL certificateMoscow laboratory MGL

Сертификат HDR Antwerp

HRD ANTWERP CertificateSupreme Diamond Council
Antwerp – HRD

The valuation standards for natural and grown diamonds are identical.

Why is the certificate required?

  • The certificate from an independent, reputable laboratory contains reliable data on the key quality parameters of the diamond.
  • It ensures that the assessment is unbiased and accurate, as it is carried out by highly qualified gemologists using modern expensive equipment.
  • If you have a certificate, you can determine how classified the quality of a diamond is, and get detailed information about its size and physical characteristics.
  • The information provided in the certificate will help determine the value of the diamond.
  • It is easier to identify the stone with it.

Information in the certificate

Each stone that passes the test receives its own identification number, specified in the certificate.

The presence of certified diamonds confirms: we produce only high-quality natural stones, the high level of which is confirmed by the best gemological laboratories in the world.

Required attributes of the certificate of conformity:

  • signature of the gemologist who conducted the examinationу
  • the print lab.

Any certificate includes 3 sections:

  1. General information about the diamond, including the identification number of the certificate that can be used to verify the authenticity of the diamond.
  2. Geometric parameters of the stone and the map of inclusions, if the document is designed as an A4 sheet.
  3. Additional information about the diamond. Here you can find more information about the features of the grown diamond. This data will help you gain a deeper understanding of the stone's characteristics.

On one of the side faces of certified grown diamonds, the certificate number is laser-printed, which can be seen when using a magnifying glass with a 10-fold magnification.

Compare the number engraved on the diamond with the number on the certificate. So you will determine the authenticity of the stone and the issued document.

Критерии оценки бриллианта

Certification takes up to several weeks. During this time, gemologists will examine the most important qualitative characteristics of the stone and assign a grade to each of them. The inspection is carried out using specialized equipment.


The company checks how much the stone shines on a scale from pool to excellent. The quality of the cut is evaluated by two parameters: polishing and symmetry.


The first sign of high quality is the absolute transparency of the diamond. The fewer spots and inclusions, the more expensive the diamond. In the Certificate, the purity is evaluated as follows:

VVS1-VVS2 - the diamond has a few minor light inclusions that can only be detected through a 10x magnification.

VS1-VS2 - the diamond has a few small patches. They can be light-colored or darkish in crystal form.

SI1-SI2-SI3 - a diamond with small inclusions. Light under the ground, dark on the edges and the girdle.

I1/2/3 - stones with defects. Marked 1 have defects that do not affect the gloss. Type 2 and 3-affect the shine.


The value of a stone is determined by its transparency. The gradation of the parameter varies from D to A for foreign standards and from 1 to 9.

The presence of luminescence

To assess this indicator, a special installation with a long-wave UV light source is used. According to the standard, fluorescence can be of different intensity.

If it is completely absent, in the corresponding column there is an inscription-None (No). In this case, the diamond will not glow in ultraviolet light, but will look transparent and dark. Such diamonds are more expensive than others.

With strong or Very Strong luminescence, a bright glow appears around the diamond. Such stones may eventually develop a risk of color loss.

Diamonds with medium luminescence Faint, Light, Medium do not deteriorate over time.


It is calculated in carats. 0.2 g = 1 carat.

You can buy grown diamonds of any shape and size, certified in the world's most reputable laboratories GIA, HDR, IGI, МГУ и MGL.

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