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Certified Diamond Network


Also called a diamond grading report, diamond dossier®, or diamond quality document


What Is A Certificate?

A diamond certificate (also called a diamond grading report, diamond dossier®, or diamond quality document), is a report created by a team of gemmologists. The stone is evaluated, measured, and scrutinised using trained eyes, a jeweller’s loupe, a microscope, and other industry tools. A completed certificate includes an analysis of the dimensions, clarity, colour, polish, symmetry, and other characteristics. Round Brilliant Cut diamonds will also include a cut grade on the report.

Each wholesale diamond we source for you over 0.50 carat comes with its own independent diamond grading certificate. This document accompanies the stone at all stages of the buying process, verifying its authenticity. As your diamond broker in Sydney, we will explain every aspect of the certificate with you and how this technical grading impacts the visual qualities of the stone you’re considering. If you’re considering a wholesale diamond under 0.50ct, upon request, we can arrange for it to be independently certified.

Further to this certification, when your handmade jewellery design is completed, you will also receive an Independent Valuation by a registered member of the National Council of Jewellery Valuers, which will further confirm the quality of the diamond or gemstones in your diamond wedding ring or engagement ring. This also provides an accurate replacement value for insurance purposes on the finished piece.

You should insist on this level of ‘before and after’ certification from your diamond broker in Sydney, as this is the best possible way of knowing exactly what you’re getting and paying for, from start to finish. This allows you to sit back and enjoy the experience, the way it should be.

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GIA Cert Example

Is All Certification Equal?

There are many types and levels of certification supplied by the jewellery industry and they are not all equal. Beware of in-house valuations and certificates, as it is not uncommon for a stone to be presented 2-3 grades better than it actually is. Much like the purchase of a motor vehicle, you would be much more trusting of an inspection by an independent motoring body, as opposed to the dealer who is selling you the car.

As trusted diamond brokers in Sydney, we advise you to insist on nothing less than the very highest level of independent, qualified certification regardless of where you purchase diamonds, gemstones, or handcrafted jewellery. If it is not available, walk away.

Who provides the certification?

The following is a list of the most qualified, consistent, and industry-respected independent diamond grading laboratories:

GIA : Gemological Institute of America –

AGSL : American Gem Society Laboratories –

HRD : Hoge Raad voor Diamant or Diamond High Council –

GSL : Gem Studies Laboratory –


While the vast majority of certifications from the above laboratories are accurate with regard to their gradings, occasionally we see some where the grades are higher than our determination. It just illustrates why our personal inspection is so important, regardless of the certification.

Pricing & Certification

Most gem diamonds are traded on the wholesale market based on single values for each of the four Cs; for example, knowing that a wholesale diamond is rated as 1.5 carats, VS2 clarity, F colour, excellent cut round brilliant, is enough to reasonably establish an expected price range. More detailed information from within each characteristic is used to determine actual market value for individual stones.

Other characteristics also influence the value and appearance of a gem diamond. These include physical characteristics such as the presence of fluorescence as well as its source and which gemmological institute evaluated the stone. Cleanliness or Raw Crystal Transparency also dramatically affects a wholesale diamond’s beauty.