GIA – Diamonds


About Gia Diamonds

GIA stands for Gemological Institute of America, as is widely considered as the standard-bearer of the diamond certification industry. Everything that the GIA does is focused on education, whether it’s for the consumer or the jeweler.

An important factor that makes the GIA our top choice for diamond certificates is the fact that they are truly an independent, non-profit entity. Every diamond that is inspected by the GIA is viewed by four expert gemologists, and it’s impossible for jewelers to “game” the system by getting grades that are better than what the diamond actually is.

About Gia Diamonds Report

A GIA diamond grading report gives you all the important information you need to know about a diamond’s 4Cs, as well as its fluorescence, any treatments and more. With a GIA diamond grading report, you can be sure that your diamond is a natural diamond. That’s because GIA has examined and tested the diamond using the most sophisticated instruments and procedures available, informed by the Institute’s ongoing scientific research.

Since a GIA diamond grading report is an unbiased assessment of a stone’s quality characteristics, it lets you compare one GIA-graded diamond to another. This empowers you to compare the quality of loose diamonds and decide which one is the best value and right for you.

Check your diamonds

Making sure the diamond you’re eyeing comes with a GIA diamond grading report is like getting an independent inspection before you buy a car or house. It’s a smart step in your purchase process – and many insurance companies will require a GIA grading report as a basis for insuring your diamond.

To be sure your diamond was graded by GIA, ask to see its GIA grading report. In addition to a full assessment of the diamond’s 4Cs, the GIA report contains a unique number, which is also sometimes inscribed on the diamond’s girdle. You can use the report number to access GIA’s online global report database, GIA Report Check, to verify that the diamond is GIA graded and view all its grading details.

An original GIA diamond grading report will have the Gemological Institute of America logo in the upper left. GIA GEM TRADE LABORATORY will be at the top of the document, with addresses and phone numbers, and the document will be laminated. The report will have a number. The position of this number will vary depending on the date issued.

Recent documents have the number in the upper left hand corner under the GIA logo. Below that number will be the date of the document. Other places in which the report number will appear will often be to the right of the centered “DIAMOND GRADING REPORT” just below the addresses and the phone numbers of the lab.

How to read GIA grading reports


GIA, Gemmological Institute of America are the world’s foremost authorities on diamonds. They established the “4Cs” and the International Diamond Grading System™. They protected all purchasers of diamonds and gemstones by providing the education, laboratory services, and research needed to determine gemstone quality accurately and objectively. As a result, GIA graded, and certified diamonds have all been independently assessed. We provide a GIA certificate with every GIA graded diamond, giving you absolute assurance and peace of mind when purchasing from Ebbeke & Co Bespoke Jewellery.

We encourage our clients to educate themselves as much as they can. However, no amount of reading can substitute viewing and comparing diamonds in person.

In our Auckland, New Zealand showroom, you can reach many diamonds side by side and learn what to look for. We prioritize educating our clients and teaching them to expertly compare diamonds of varying qualities and sizes and help you make an informed choice. How are diamonds compared? How can you evaluate diamonds? Who evaluates diamonds? This is why a diamond grading system and methodology were invented, and Gemmological Institutes were created. Diamond Certification is a document you receive from an objective 3rd party lab that describes a diamond in all its characteristics.

Trained professionals evaluate, scrutinize and measure the diamonds. Although not all diamond certificates are the same, a GIA (Gemmological Institute of America) certificate is the original and, in our opinion, the most trusted grading system in the world.

A diamond’s 4 C’s represent the four main components of its beauty and structure: Cut, Colour, Clarity, and Carat. When looking at a diamond, the eye perceives a balance of its characteristics and components, including but not limited to the 4 C’s.