Our solitaire diamonds and centre stones are provided with an official certificate by one of the leading grading institutes including the GIA, IGI and WGI. Each certificate is specific to each diamond and is included with your finished diamond jewellery item. We will also retain an electronic version on file for future reference.

Each diamond certificate details the specifications of a diamond and are an assurance of it's quality and integrity. At Pobjoy we guarantee that each diamond we sell comes with a certificate from only the most respected and recognised grading laboratories and institutes in the industry, of which the GIA is considered the most dependable.

This is because GIA grading of the two subjective aspects of each diamond - colour and clarity - is identified as being the most consistent.

Not all gemological grading institutes are equal. If you are looking at a diamond from a UK retailer without a certificate or with a certificate from an insititute or entity not featured here you may need to question it's authenticity and the accuracy of it's grading.


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 thermoelectric 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 laboratory grown or some other type of simulant.

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


For diamond set jewellery the individual carat weight of each stone is generally less than 0.20 (or '20 points'). Where the colour and clarity is specifically referred to in our product summary we are usually able to provide a third party certificate of 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.