Natural mined and ethical lab grown

Why you should only buy a diamond with independent grading & certification

There are several independent gemological institutes which provide grading services and certification. This applies both to natural earth mined and lab grown diamonds.

The credibility within the industry of each grading institute is largely determined by the consistency of how it grades each diamond.

In this respect the GIA and IGI are often regarded as the most consistent with the AGS, WGI, HRD, SGL and EGL considered respectable alternatives.*

In some cases your jeweller may only offer you their own diamond grading certificate.

This is not sufficient, due to the inherent conflict of interest that exists; it is much like marking one's own homework!

Therefore, if the diamond is around a quarter of one carat or greater, insist upon it being graded independently, even if you are required to pay for it.

And remember, Pobjoy only sell individual diamonds graded and certified by the most respected third party grading institutes in the industry.

Each diamond certificate we provide with our precious gemstones includes the precise specifications of your diamond.

It is an independent, verifiable assurance of it's quality and unique characteristics.



You can also verify your diamond and it's certification free of charge against the GIA and IGI online databases.

This also applies to lab grown diamonds.


IGI certified lab grown diamond report - Pobjoy Diamonds


Courtesy of the International Gemological Institute

The IGI first offered the comprehensive grading of lab grown diamonds in 2005.

The process of evaluating the overall grade and specification of each diamond is exactly the same as for natural mined diamonds.

In addition to the report document created for each stone, the certificate number is nano - inscribed around it's girdle (outside rim), although this can only be seen under ten times magnification.

GIA lab grown diamond grading report example - Pobjoy Diamonds
GIA lab grown diamond certification and grading

Although the GIA has also been involved in the grading of lab created diamonds for several years, it only started offering full certification in 2020.

As with the IGI, each lab created diamond is inscribed along the girdle of the stone.

It is otherwise impossible for even the most experienced jeweller to tell the difference between a natural and a lab grown diamond.

Inscribing aside, it is only the extensive skillsets and extremely sophisticated equipment at the disposal of the specialist grading institutes, that a natural diamond may be distinguished from a lab grown stone.

And in case you were wondering, a lab diamond cannot be told apart from a natural diamond when using industry-standard technological tests (except for the highly advanced processes employed by the IGI and GIA).

The majority of jewellery grade, cut and polished lab grown diamonds originate in the Far East, India and the USA

All our diamonds are conflict free and conform to the Kimberley Process.

* Natural mined diamonds. Independent Source: 'The Diamond Pro'


Before diamond jewellery, polished loose diamonds and coloured gemstones are presented to you we carry out additional verification for added peace of mind.

Using an industry standard thermo and electric probe all our diamonds are checked for authenticity independently from the certification provided. This technology does not facilitate a detailed grading process but assures that the diamonds and semi precious stones are real and not simulated.

The results are kept on record with other detailed notes including certificate numbers, electronic copies of each certificate and photos of each item of jewellery for future reference. This also means that we are able to verify items returned to us, for example for polishing, before sending back to you.


For diamond set jewellery where the individual carat weight of each stone is generally less than 0.30 (or "30 points") we are usually able to provide a third party certificate of grading verification.

For example, a Hatton Garden Diamond Laboratory certificate provides a photo of the item, the grading of the precious metal used and the diamond grade.