Diamond Certification Guide

Every diamond sold by a reputable jeweller or dealer should come with an accredited certificate. This is where all the specifications and characteristics of a given stone have been professionally assessed by a trained and fully qualified gemologist in controlled conditions.

There are several professional bodies and laboratories that specialise in providing certifications:

1. GIA - The Gemological Institute of America

2. IGI - International Gemological Institute

3. EGL - European Gemological Laboratory

As with every aspect of your once-in-a-lifetime purchase, there are a number of points you need to be aware of before proceeding:

When it comes to manufacturing jewellery and silverware, precious metals (silver, palladium, gold and platinum) are rarely used in their purest form. Instead, they are usually alloyed with lesser metals to achieve the desired strength, durability, and colour.

It is not possible to detect the precious metal content of an item by sight or by touch. It is, therefore, a legal requirement to have items consisting of silver, palladium, gold or platinum independently tested and then hallmarked before they can be described as such. Items must bear a hallmark at the point of sale, subject to the following weight exemptions:

• Silver: mandatory for items above 7.78 grams;

• Gold: mandatory for items above 1 gram

• Palladium: mandatory for items above 1 gram

• Platinum: mandatory for items above 0.5 grams.

ABELINI LTD. is registered with the Assay Office London, ensuring our precious metal jewellery is compliant with the UK’s hallmarking regulations. All stock is subject to an internal confirmation process to ensure it meets the UK’s hallmarking regulations before it is dispatched to our customers.

For articles that are below the UK Hallmarking Act’s mandatory weight for hallmarking, ABELINI LTD. operates a separate due diligence process that involves periodic voluntary testing of items that fall below the mandatory weight to ensure that they meet the minimum fineness requirement.

We are an Assay Assured Jewellery Retailer. Assay Assured status is only given to retailers who have been independently audited and verified by Assay Assured, which is run and overseen by the Edinburgh Assay Office and ensures that all precious metal jewellery (except items exempt by weight) are independently tested and hallmarked.

Grading Quality: It’s important to note that the grading quality will differ between labs, and they aren’t as yet held to a definitive objective standard. A number of lesser-known laboratories and bodies will lower their grading quality criteria under pressure from retailers who want to maintain the ability to charge as much as they possibly can. That’s why at Abelini we only use the most highly regarded certifiers to make sure you receive nothing but the premium luxury you deserve.

Grading Quality: A cheaper offer from a certifier you have never heard of may sound like a great way to save money, but the important thing to remember is that your certificate is ultimately there to give you peace of mind by giving an objective and reliable measure of what you are actually getting for your money. This tells you straight away that you certainly don’t want to cut corners when it comes to the quality of your certification.

Storage: Be sure to keep your certificate in a safe place for future reference. It is the most reliable piece of documentation if you ever come to sell your piece in the future, and it is also essential if you are to properly insure your piece for its true value. Being able to accurately identify your diamond in the event of theft, it allows you to maximise your chances of recovering it.

To learn more about the intricacies of diamond certification, please don’t hesitate to get in touch with our dedicated team. They’re always on hand to answer any questions you may have so that you can buy with the confidence and peace of mind that you deserve.


A diamond certificate essentially means that the diamond has been officially evaluated to determine its authenticity and other specifications such as carat, clarity and the cut of the diamond. If you choose to certify your diamond, you receive a certificate that shows that your diamond has been certified by an independent laboratory.

A diamond certificate acts as a summary of your diamond, stating its carat, clarity and cut amongst several other aspects. Each certificate will have its unique number which you can use to access a digital version of the report. The certificate essentially acts as proof of the quality and value of your diamond. To read the certificate, read the different grading scales to understand the quality of your diamond or consult with an expert.

Not every diamond will automatically come with a certificate. A diamond will only come with a certificate if it has been certified by a laboratory. Non-certified diamonds are just ones that haven’t undergone formal lab grading.

To check that your diamond certification is real, just enter your report number into the GIA’s certificate verifier. The GIA database can quickly determine whether the information on your report matches the report archived in the report database. If the information doesn’t match up with the GIA’s report, it's likely your certification has been faked.

The European Gemological Institute (EGI) certificate is a reliable and accurate form of documentation that verifies a diamond's identity and grade. The EGI use an internationally recognised diamond grading system to certify any diamond sent to them.

The Gemological Science International Diamond (GSI) diamond certification isn’t as reliable as other forms of diamond certification, however it’s still a form of verification of your diamonds. Their grading is viewed as being slightly looser than other diamond certifiers.

To some, IGI is one of the most respected diamond certification labs in the world. It is also one of the world’s oldest, certifying diamonds for over 50 years. Their reports are seen as reliable and impartial however some experts would recommend other labs due to claims of looser grading systems.

Nowadays, most people deem the GIA or AGS as the most reliable and accurate diamond certificates. They’re seen to be the most consistent with their grading and are more trusted in determining a diamond's clarity and cut quality.

Regardless if the diamond was mined or lab-grown, it can still be certified and come with a diamond certificate. All major certifiers including IGI, GIA, AGS and EGL will certify both natural and lab-grown diamonds, displaying their characteristics in a certificate.

A diamond grading report can sometimes be referred to as a diamond certificate however both are slightly different things. A grading report will go into much more detail about the individual characteristics of a particular diamond. This will include in-depth details on the clarity, colour grade, cut grade and carat weight. A certificate on the other hand will just display the main aspects of your diamond without going into too much detail on the specifics.