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Certificates Explained

As a potential diamond buyer you should be aware that there exists no single set of criteria diamond laboratories use to grade diamonds. Every laboratory has its own, different set of standards.

A non-independently certified diamond and an independently certified diamond might look exactly the same, because, essentially, they are.

Certification of a diamond doesn’t necessarily mean it is superior. An independently certified diamond has paperwork stating it is a certain shape, weight and quality of diamond. A diamond laboratory certificate is not a guarantee of any kind – just like the certificate you receive with a non-independently certified diamond.

For insurance purposes a valuation certificate (also known as appraisal) is required by the insurers, this is a separate document to the diamond certificate itself. Diamond certificates do not include an estimated retail replacement value as appraisals do.

Which diamond is more beautiful? Can you tell by looking at these reports?

We can’t. Not without looking at the actual diamond.

Two diamonds – even with virtually identical certification – can still look very different.

Diamond appreciation is a personal thing, different people will prefer different things about different diamonds. If you do not like the look of a diamond and you feel it isn’t the one for you, a certificate is not at all likely to change this. Your diamond should sparkle, displaying excellent brilliance, fire and scintillation in a way which suits your style.

If you would like further advice or guidance in choosing the best diamond for your budget, you can contact with one of our trained diamond experts via telephone or email. Aariya Diamonds will happily endeavour to guide and advise you in your selection of the best possible diamond at the best possible price.

If you would like further advice or guidance in choosing the best diamond for your budget, you can contact with one of our trained diamond experts via telephone or email. Additional factors such as fluorescence can affect how the colour of the diamond appears – this is not usually shown in a lab grading report. For example, diamonds with an I colour grade can exhibit a yellow tint of fluorescence which may make a diamond appear to be a K colour grade in certain light, despite the certification. On the contrary, diamonds with a J colour exhibiting a blue tint of fluorescence can face up white, but a lab diamond grading report will not tell you that the stone looks like an H-I colour in an alternative light.

How to determine the sparkle of a diamond from the 4Cs or from the certificate details?

The simple answer is: you can’t.

The most important factor is the overall beauty and sparkle of the diamond. Many diamonds with a high colour, clarity and cut grade will not have excellent sparkle. In fact most mass market diamonds don’t have a superior level of sparkle. This is the reason why we reject 90% of all the diamonds we inspect before buying. We ensure that all the diamonds we purchase are of the utmost quality, which translates into beautiful diamonds with great brilliance and sparkle. Most companies work from a database, advising customers on the diamonds based on the information in the diamond grading report, our diamond experts work directly with the individual stones based on each individual order or bespoke request.
Diamond Grading, Specifications and Certification don’t necessarily match with the diamond’s beauty.

Why don’t I need a diamond with a laboratory certificate?

The only factor usually missing from all certificates or grading reports is the transparency of a diamond. At present there is no set industry- wide standard to grade the transparency of a diamond. Without this vital detail there is no way to know if a diamond will look beautiful and be full of life and fire, grading reports rely almost directly on the 4Cs.

We reject most of the diamonds we view because they don’t pass a basic transparency test, which we think is even more important to appearance than cut.

Transparency, also called pellucidity, is the material property of allowing light to pass through and the degree to which a material transmits light. Transparency is directly relevant to the visible cloudiness or haziness of the material; low transparency will make a diamond appear ‘cloudy’ or ‘milky’. Assessment of transparency is a comprehensive assessment of light performance based on the quality of the diamond crystal itself.