What is a GIA Diamond Grading Report?


What is truly valuable to anyone who owns a diamond is the knowledge of the characteristics of their stone, and how important those qualities are. One way to identify the unique traits of your diamond is a GIA Diamond Grading Report. But what is the GIA, how does it relate to your diamond, and is it important when determining the value of your stone?

There’s much more to a diamond than meets the eye. When observing these brilliant gemstones, you may notice that diamonds come in many different shapes, such as rounds and pears, many different colors, including colorless and candy apple red, as well as different carat sizes. But there are other important diamond characteristics that you may not be aware of because they are less apparent to the naked eye, like fluorescence and symmetry, but are all critically important to the value of a diamond. In order to know how much a diamond is worth, it is important to understand the fundamental characteristics of a diamond and all the different ways they can be graded. One resource that is helpful is the Gemological Institute of America (GIA). If you have ever purchased a diamond, or are looking to sell one, chances are you have heard this name. But what is the GIA, how does it relate to your diamond, and is it important when determining the value of your stone?

GIA Diamond Image 1

What is the GIA?

The Gemological Institute of America (GIA) is an educational institution of gem research and diamond grading. There are many reputable diamond grading labs across the world including the EGL and the IGI, but the GIA is the largest, most established and often considered the golden standard for Diamond Grading Reports. Their laboratories span almost every continent, including North America, Europe, Asia and Africa. According to GIA’s website, “the Institute developed the International Diamond Grading System™ and the 4C’s of diamond quality”, which are used and recognized by industry professionals around the world. GIA’s Graduate Gemologists meticulously examine each submitted diamond for its unique characteristics, including color, carat, clarity, cut, and more. After a thorough and precise examination using an industry standard 10x microscope, the GIA issues an objective and unbiased Diamond Grading Report for each diamond.

What is a GIA-Certified Diamond?

Many people are under the belief that the GIA issues certificates for the diamonds they’ve graded. Even the trade refers to this paperwork as certificates. It’s a common mistake. The GIA actually produces a Diamond Grading Report upon completion of their examination. There is no mention of the word, ‘certificate’ or ‘certified’ anywhere on the report. That said, when we hear of a “GIA certificate” or “certified diamonds,” this is what they are referring to. A GIA Diamond Grading Report typically includes:

  • GIA Report Number
  • Shape and Cutting Style (For example, Round Brilliant Cut)
  • Measurements (the length, width, and depth of the stone in millimeters)
  • Carat Weight
  • Color Grade
  • Clarity Grade
  • Polish
  • Symmetry
  • Cut
  • Fluorescence
  • Plotted Diagram of any inclusions or blemishes (For example, feathers, crystals, or chips)
  • Indications of treatments, such as HPHT or laser drills
  • Laser Inscriptions (if any)

GIA Diamond Grading Reports can take up to several weeks to complete. Their cost is based on carat weight and can range anywhere from $50 to thousands of dollars due to the extensive and intensive nature of identifying and grading diamonds and colored gems.

GIA Diamond Grading Report

Does a GIA Diamond Grading Report Affect Value?

Diamonds with GIA Diamond Grading Reports are not necessarily more valuable than diamonds without them. A diamond’s value will come from the diamond’s immutable characteristics – and of course the supply and demand of those attributes at a given time. It’s also important to note that Diamond Grading Reports don’t tell the entire story. For example, two Round Brilliant Cut diamonds may weigh the same, have identical color and clarity grades and in other respects be quite similar. On paper they are very similar. However, one diamond may have a “Good” Cut Grade, and the other might have a “Very Good” Cut Grade. This difference, though slight at first glance, can have a large impact on the price you‘ll receive.

While the knowledge of your diamond’s characteristics may help you in understanding its value, a Diamond Grading Report is not a prerequisite when selling your diamond. It is a way to identify the characteristics of a given stone. A highly trained Graduate Gemologist using these standards should also be able to evaluate your diamond for all these important characteristics. At Mondiamo we have the expertise to assess the qualities of your diamond and will make you an offer to purchase it based on those characteristics.

Highly trained diamond buyers know how to look for the nuances which can increase the value of your stone. At Mondiamo, we provide a sight-unseen guaranteed offer range based on the parameters of any reputable Diamond Grading Report such as the GIA.

GIA Mondiamo

Mondiamo’s Team of GIA Graduate Gemologists

Mondiamo’s Client Care Team is comprised of GIA Graduate Gemologists and uphold the highest standards of the Institution’s diamond grading practices. This is why Mondiamo can purchase diamonds both with and without GIA Diamond Grading Reports; our team’s knowledge and utilization of GIA’s International Diamond Grading System™, along with our global distribution network in Asia, Europe and the Americas, gives our clients confidence that they will receive the very best prices for the diamonds they wish to sell.

If you want to sell your diamond, a Diamond Grading Report can expedite your offer from Mondiamo. If you have a Report number, submit it online here and receive a guaranteed offer range within 1-2 business days. But if you don’t have a Report, that’s okay too. Our Client Care Team is equipped to evaluate your diamond without one. Utilize our free and insured shipping program to send your diamond to Mondiamo and receive an offer from one of our specialists.