The certificate could be compared to the diamond's identity card. It is the document that gives us all the information about it and allows us to know its real value. It's the gemological certification that distinguishes one diamond from the another in a way that makes them unmistakable and unique.

It was not until 1970 that gemological certificates and, therefore, certified diamonds made their appearance. Since then, it has been a document of vital importance in the sale of diamonds by retailers, although it is also an essential reference for diamond makers and merchants in the sector.

certified diamonds

What is the GIA certificate?

The entities that issue diamond certificates are gemological laboratories, which have sophisticated tools capable of determining the nature and properties of stones in accordance with international standards.

The Gemological Institute of America (GIA) is probably the most prestigious entity when it comes to certifying diamonds and, therefore, its opinions are highly reliable. Apart from the GIA certificates, other entities such as the International Gemological Institute (IGI) also have a great reputation when it comes to producing diamond certificates.

This field has been developed in such a way that there are even now certificates that guarantees that the diamonds do not come from a country in a situation of war.

How to know the price of a diamond?

A gemological certification provides an accurate information on the diamond measurements, depth, surface percentage, possible fluorescence and or the uniqueness of its internal characteristics. However, contrary to what you may think, the certificate doesn't give information about the financial value of the gem.

certified diamonds in 2021

Among the factors taken into account when evaluating a diamond include:

  • The shape of the carving.
  • The weight of the diamond (in carats).
  • Its degree of color.
  • Its degree of purity.
  • Its degree of fluorescence.
  • The quality of the carving: the best known are brilliant, pear, marquise, emerald, oval and heart.
  • Polishing.
  • Symmetry.
  • Its dimensions: height, diameter, minimum and maximum diameter in the girdle (in millimeters).
  • The thickness of the girdle (the widest part), the size of the cut (the end), etc.
  • The date of issuance of the primary certificate.
  • Imperfections: black spots, clouds, feathers, etc.

A certified diamond does not have to be more valuable than one that does not have this document. However, it does represent a guarantee of quality, which is why at Leonards Jewellers, we only work with certified gemstones.

In addition, you should know that you can request an appraisal of the diamond to know its initial monetary value according to the criteria of the professionals. The ideal is to go to a jeweler appraiser. Of course, you should know that in no case does the valuation give a fixed price to the gem. "The selling price of a diamond will depend on the market when the sale is made: wholesalers, individuals and or the liquidation market.

diamond investment 2021

Buy certified diamonds

As we already told you in our blog, when buying diamonds, you should look at four parameters, popularly known as the 4C’s: Carat (carat weight), Color (color), Clarity (purity) and Cut (size). But since at first glance it is difficult to assess these parameters, especially if we are not qualified experts, we always advise you to opt for officially certified diamonds.


Without a diamond certificate from an official laboratory, a consumer will not be able to determine the quality and value of a diamond when reselling it and will lack any supporting document as insurance. Therefore, we advise you to be wary of those who cannot present the diamond certificate at the time of purchase.

Invest in diamonds

If you access the online store of certified diamonds at Leonards Jewellers, you will see that not all diamonds are only available for great fortunes. In fact, today almost anyone can invest in diamonds. In fact, if you are looking to buy a gemstone as an investment, it is an excellent option, since buying them loose at online stores will allow you to easily acquire them and then resell them when it suits you best.


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