Diamond Reports and Certification

Our Reports and Certificates

All of our diamonds above 0.3 carat come with a certificate or a report from a diamond grading laboratory. We realise that you are buying over the internet and therefore need to be confident in your purchase. Your diamond certificate is done by a gemologist (a diamond expert) outlining the specific features of your diamond in detail. Certificates are a way of identifying your diamond, and also allow you to be confident that when you pay for a certain stone, then it is what we say it is.

Diamond Grading Laboratories

We have made sure that your diamond will only be certified by an Independent Diamond Grading laboratory. Independent laboratories only examine and grade diamonds, they do not sell them. Therefore they will not make any diamond a better grade than it actually is -the certificate will be true to your stone.

The laboratories we use in New Zealand are:

Advanced Gem Laboratory (AGL)
GemLab - Auckland, New Zealand
Gemlink (DBL)- Christchurch and Wellington, New Zealand

The International laboratories that we use are:

GIA - The Gemological Institute of America
HRD - (Hoge Raad voor Diamant)

Diamond Certificates - What is Detailed on Them?

This is an example of a GIA certificate; the features of your particular diamond will be marked upon the two round faces at the bottom of the page, representing the top and the bottom of the stone.

Some key points of your diamond certificate:

Cut: How expertly it was cut and polished. To make a diamond really sparkle, it must be cut to very precise symmetry and dimensions. Learn about Diamond Cut.
Clarity: Clarity outlines exactly what flaws are apparent in the diamond. Some stones are flawless, but most have a level of flaws. Tiny flaws will not affect the performance of a diamond. Learn about Diamond Clarity.
Colour: This will record the diamond's colour rating, from colourless (grades D-H) through to yellow (M-Z). Learn about Diamond Colour.
Carat: This will record the precise carat weight of the diamond. Learn about Diamond Carat.
Some laboratories use machines and computers (Sarin and OGI) to measure the dimensions and symmetry of the diamond accurately for your report.

How Your Diamond Certificate is Written

Diamond grading, in terms of colour and clarity, is largely down to human judgement; so when grading a diamond, the laboratories we use invest teams of at least 2 gemologists to separately analyse your diamond. They need to agree on the colour and clarity of your diamond for your report. They can use machines to accurately analyse the cut, symmetry and proportions of your diamond.

In order to write your certificate or report, your diamond:

will be thoroughly cleaned;
is examined through a 10x magnification loupe and slowly rotated from one facet to the next noting down any marks/inclusions; Learn about Diamond Clarity.
will be compared to a series of master stones to assign it its colour grade and fluorescence; Learn about Diamond Colour.
and will then be analysed through the computerized machines to determine its carat weight, symmetry and cut. Learn about carat weight.

Ensure that an independent grading expert reports on your diamond

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