What You Need To Know About The GIA Diamond Certification Process

If you have ever purchased a diamond from a trusted supplier in the past, then you should’ve received a certificate with your purchase that provided you with essential information about the particular diamond that you have purchased. Even jewelry that contains diamonds should come with a certificate to disclose the grading results of the diamond or diamonds that have been fitted into the particular jewelry. There are different institutions that can issue a certificate after a diamond has been graded, but, amongst all the institutions that can be utilized by jewelers, the Gemological Institute of America, or simply GIA for short, is the most popular and also known as the strictest institution throughout the entire world.

The Gemological Institute of America was founded in 1931 and, since then, have been offering professional gem analysis and appraising services to jewelers, gem collectors and the general public. The company does not only specialize in diamonds, but has experts that are able to offer appraisal services for a variety of gemstones, including diamonds, of course, and fancy color diamonds. Other gemstones that the GIA appraised include amethyst, amber, citrine, emerald, aquamarine, moonstone, rose quartz, pearl, tourmaline, ruby, sapphire and more.

How The GIA Grades A Diamond

The GIA is considered to be the best institution for grading a diamond. This is mostly due to the fact that they have quite a strict set of rules and regulations that their appraisers have to follow when they grade a particular diamond. This also means that the GIA’s certificates are much more accurate than many of the other laboratories and institutes that also offer a diamond appraising service. A more accurate certificate means the customer will not have to worry about paying too much for a diamond as careful the quality and value of each diamond has been carefully considered by the professional gemologist that appraised the diamond.

There are a few factors that the GIA looks at while they grade a diamond. These factors all play a part in the value of the diamond. The higher quality the diamond is graded, the more it will cost, obviously. The following are all factors that the GIA considers when one of their gemologists grades a diamond:

  •  gia carat weightDiamond Carat Weight – Probably the most important aspect of diamond that affects the price of a diamond stone is its carat weight. The more a diamond weights, the higher it is priced. In addition to being weighed with a professional toolbox, a diamond is also measured with a special measurement tool that has been specifically designed for diamonds and gemstones measurement. The proportions of the diamond are taken into consideration during the grading of a diamond.
  • Diamond Clarity – The GIA’s gemologists are also trained to grade the clarity of a diamond they are analyzing. The clarity of a diamond refers to the inclusions, blemishes and other imperfections that can be seen on the diamond. A diamond with fewer cavities and inclusions are graded at a higher level in diamond clarity chart/Scale than those with visible blemishes and inclusions.
  • Diamond Color – In addition to carat weight and diamond clarity, the color of an analyzed diamond is also considered important and has an impact on the price, grading and quality of a diamond. A diamond that is rated with a color grading of “D” does not have any color tones, while a diamond that has a color grading of “Z” has a lot of yellow color tones.

Apart from the clarity, carat weight and color aspects that are taken into consideration, the GIA will also consider the diamond’s cut quality and level of fluorescence when they decide the value and what the best quality of the diamond.


The Gemological Institute of America, or GIA, is known as the best in the business of appraising gemstones, such as diamonds. The company has been providing professional services for almost 100 years now, and they have quite a large number of certified professionals that can grade a stone and issue a certificate to validate the grading.

Jarrett Abbott


Jarrett first learned about the beauty of diamonds while mulling over various options for his wife to be. His desire to be the best at everything he does led him to start TheDiamondAdvisors.com. His takes on the industry can be found on this website as well as quoted in many media publications. Contact him here for media inquiries or if you have questions about purchasing from any online vendor.

Leave a Reply

Your email address will not be published. Required fields are marked *