How to read the GIA certificate

GIA diamond certificate

What is GIA?

GIA stands for gemological institute of America. The GIA is based in Carlsbad, California, since 1931. It is a non-profit organisation that educates people on gems and jewellery. GIA is one of the most trusted and largest geology education and research institute. GIA provides laboratory services for gem evaluation worldwide.

What is a GIA certificate?

GIA grades diamonds and generates an entire report about their cut, colour, clarity and carat, this report is known as the GIA certificate. GIA-certified diamonds are considered valuable because of their accuracy and reliability. They are traded at upscale, as GIA has earned such incredibility and integrity in the market that people trust GIA certificates without a single question.

Important things you, need to look for in the GIA certificate

GIA mentions many things in the certificate. Let’s get into the details of that one by one.

The date of the report

The date is mentioned on the top of the certificate. It is the date when the certificate is issued.

GIA report number

It is a unique number designated by GIA for every diamond that GIA grades. This number is also there on the diamond. This distinct number provides identification to your diamond.

Shape and cutting style

It describes the shape of the diamond, whether it’s a classic round or other fancy shape diamond. Along with that, it also gives details on cutting style i.e. facet arrangement style. For instance, whether it is a brilliant cut or a modified brilliant cut.


The Diamond’s length, width and height are mentioned in the measurement section.

Carat weight

A Carat unit is used to weigh the diamonds. 1 carat is equal to 0.200 grams. So 1 carat of a diamond is 1/5 of a gram. Here the diamond weight in carats will be mentioned.

Colour grade

GIA has developed a colour scale from D to Z, which is the standard scale in the industry. In this scale, as it goes from D to Z, the colour inclines a little towards yellow or brown.

Clarity grade

Inclusions and blemishes are imperfections, which affect the clarity of the diamond. The GIA’s clarity scale has a range from flawless to I2. The clarity of the diamond goes down in this range.

Additional grading information

In this section, GIA provides information about polish, symmetry and fluorescence. The smoothness and finish of the facets decide the level of polish. Symmetry refers to the alignment of the facets in the diamond. The diamond emits visible light when expose to ultraviolet rays or turns blue under black light, this is known as fluorescence.

On the other page, GIA provides diamond diagrams. In this digital diagram of diamonds, proportions and clarity characteristics are picturised. This is a very simple way to understand the dynamics of the diamond.

All this information is also available on the official website of GIA. You will need the GIA report number for that.

GIA certificates make it very convenient and easy to understand all the information about the diamond which you might want to purchase.

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