Great Diamond

Gems and Jewellery

Diamond Certificates

What is a Diamond certificate?

A Diamond certificate is a report created by a team of gemmologists to evaluate the quality of a diamond. This is also known under a few different names:

  • Diamond Grading Report
  • Diamond Dossier
  • Diamond Quality Document

The gemmologists will evaluate the diamond for its dimensions, carat, clarity, colour, polish and symmetry. There will also be a few further specifications taken from a diamond to complete the certification process. Tools used to evaluate the diamond are jeweller's loupes, trained eyes, microscopes and other industry standard tools.

Why do I need a diamond certificate?

A diamond certificate is your proof of purchase. You will require this, along with a completed valuation so that you get your item correctly insured. Purchasing a diamond without this will result in difficulties of getting your jewellery protected.

What types of certificate are there?

There are ranges of diamond certificates you can select from, some are well recognised in the trade while others are not. However please note if you purchase any of these certificates your diamond, your insurance company will accept them 100%.

Established in 1931, GIA is the world's foremost authority on diamonds. After revolutionising graded the GIA has continued to provide unbeaten quality and service worldwide.

The GIA laser inscribes many of their diamonds (post January 2006) to ensure each matches the applicable certificate. You will need a loupe of 20x magnification to see this, failing that you will require a microscope. We have one available in store should you wish to view the inscription, however this is another added guarantee for any customer purchasing a diamond.

You can get more information on the GIA by visiting their site here.
The IGI was established in 1975 and to this day is one of the oldest based in Antwerp. They're one of the largest grading laboratories with offices in Antwerp, New York, Hong Kong, Mumbai, Bangkok and many more.

You can get more information on the IGI by visiting their site here.
The AGI was founded in 1958 in the historic city of Antwerp, Belgium. With the city of Antwerp being synonymous with diamonds, it made the perfect base for a worldwide grading laboratory. They also have offices in the United Kingdom, Mumbai and many more. Another interesting fact is that they were the first grading laboratory to establish a base in the United Kingdom.

You can get more information on the AGI by visiting their site here.
The gemmological institute of Europe was established to protect customers when buying or valuing their diamonds, precious stones and precious jewellery. GIE is an independent foundation with offices around Europe and the world. GIE has been serving the international diamond industry for more than 30 years. GIE operates various services dependant on the individual laboratory. However all GIA laboratories offer core services : Diamond Lab, full diamond grading laboratory , which is respected worldwide by the diamond industry and by the general public alike; Precious Stones Lab; Jewellery valuation service. In addition the GIE invest heavily in research and development to counter the growing use of Laboratory Enhanced Diamonds. GIE stands for quality, tradition and the highest standards. Regular meetings are held with laboratory directors to ensure the current equipment is up to date and that only the highest standards are offered by their laboratories.
These diamonds are certified in a slightly different way to the GIA/IGI/AGI diamonds. These diamonds are purchased in parcels containing 50-100 stones simply marked SI and D-G for example. These parcels will then be inspected to see if the diamonds inside are of a good quality. We only select the best stones from these parcels. These diamonds are then sent off to IDGL laboratory to be independently certified. When they return to us they’re fully certified along with all the applicable documentation.

The advantage of buying diamonds this way is the way they’re priced. We buy these at a set price regardless of if the diamonds is an SI1/D or an SI2/G. This allows us to price these diamonds at a far more competitive price; we then pass the savings on to you.
The short answer is no. If you're purchasing a single diamond that is 0.30ct or above you should expect to receive a diamond certificate. For diamonds that are smaller than this you should expect to receive a jewellery appraisal to cover the characteristics and replacement value for these diamonds. If you do purchase an un-certified diamond you may think you've got an amazing price, however there is no 100% proof that what you have brought is accurate, you will also find it extremely hard to get un-certified diamonds insured. Please be very careful!






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