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Diamond Blog

12 August 2008
Diamond Grading Laboratories Examined
Posted By Richard Preece

Diamond Grading Laboratories Examined

You already know that it is important to buy certified diamonds. This is the only way you know what you are buying.

Certified diamonds are assigned grading according the international diamond grading system of the 4Cs - cut, carat, colour and clarity. This is a universally recognised system and provides consistency in the world of diamonds. This system was founded some 70 years ago by the GIA - the Gemological Institute of America.

At DeJoria, we work with the main diamond grading laboratories in the world, as diamonds which come accompanied by these certificates "are what they say on the tin" - in other words, we can be confident that the diamond certificate matches the diamond. This is of course important to us and our customers, made even more so by the fact that we submit all our diamond engagement rings for an independent valuation at the end of the production process, so we want to make sure that the diamond and certificate match up together.

We work with the GIA, IGI, AGS and HRD.

Diamonds that are accompanied by GIA certificates are the most highly valued in the industry as their quality is considered guaranteed. The GIA provides 2 types of certificates -
GIA diamond dossier - This is a compact diamond grading report which analyses the 4Cs of diamonds for you. Diamonds with this GIA diamond dossier have the GIA certificate number microscopically laser inscribed into the girdle of the diamond.
GIA diamond grading report - This is considered by fine jewellers and major auction houses as being the world's premier gemmological credential. This diamond grading report is issued for diamonds of one carat upwards of all shapes, and provides the most comprehensive analysis of a diamond's quality. It is also provides a diagram of the diamond's clarity characteristics - in other words, it shows the location, size and type of inclusions in the diamond.

The GIA assign an overall cut grade on their diamond certificates, although this is for brilliant round cut diamonds only, and only on brilliant round cut diamonds graded since January 2006.

Founded in 1975, the IGI is another of the world's leading diamond laboratories. Each diamond is scientifically analysed using state of the art technology. The IGI issues approximately 1 million reports each year. The IGI was founded in 1975 in Antwerp and grew from an original staff of 3 to over 450 professionals spread over a worldwide laboratory network that now includes New York, Hong Kong, Mumbai, Bangkok, Tokyo, Dubai, Toronto, Los Angeles and Tel Aviv.

The AGS has been issuing diamond grading reports since 1996 and is one of the world's premier diamond grading reports. With an AGS document you are assured that the grade of the diamond is equal to its quality. As the consumer, you are empowered with detailed information about your diamond, and you can rest assured that the diamond grading report is one of the industry's most consistent.

The HRD is one of the most recognised diamond laboratories in Europe, since the majority of diamonds passing through Europe's diamond centre of Antwerp in Belgium are accompanied by this certification. Using ever-evolving scientific techniques and a team of highly skilled gemmologists, the HRD diamond grading report provides excellent supporting documentation for your diamond engagement ring.

For more information on diamond grading certificates, please click here.

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