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A diamond grading report or certificate is an independent quality report about a specific diamond. It is issued by a diamond grading laboratory with no affiliation to any retailer, giving the consumer a completely objective opinion on the diamond’s quality. This document includes the exact measurements, proportions, color grade, clarity grade, cut grade and carat weight of the diamond. It also includes specifics that most jewelers do not have the equipment or knowledge to determine such as the diamond's fluorescence, polish, and symmetry*. Each document is numbered, dated, and illustrates the internal and external characteristics of the diamond, otherwise known as a 'plot'.

It is important to note that there is no governing body responsible for the standardization of a diamond report. Each company has the latitude to judge to the standards which they feel are appropriate. For this reason, many laboratories fall in/out of favor depending on how it is being operated. It is also important to know that every grade received has an allowance for deviation. For example, a diamond that has been graded excellent for proportions, polish, and symmetry does not mean that it is 'perfect'. Rather, it refers to the fact that all of those qualities fall under a pre­determined standard, which has allowances for error.


The leading diamond laboratories in the world are the Gemological Institute of America (G.I.A.), The American Gem Society (AGS), Forevermark Diamond Institute, and the European Gemological Laboratory (E.G.L.). Any diamond can be evaluated by G.I.A, A.G.S, or E.G.L. for a fee. The Forevermark Diamond Institute tracks the diamond’s source and therefore will not accept diamonds from outside its own supply chain

  • GIA (The Gemological Institute of America) ­ established in 1931 and is recognized as the world’s foremost authority in diamond grading. The G.I.A. grades natural, synthetic and treated diamonds. G.I.A. refers to their document as a Diamond Grading Report or a Diamond Dossier (depending on carat weight).
  • AGS (American Gem Society) was founded in 1996 with a mission to help protect the consumer by establishing stricter guidelines of diamond grading. They were the first laboratory to establish the ideal cut grade for round brilliant diamonds and features innovative technology that measures the light performance of diamonds. AGS produces both Diamond Quality Certificates and Diamond Quality Reports.
  • Forevermark diamonds are graded at the Forevermark Diamond Institute in Antwerp, Belgium. The Forevermark Diamond Institute will only grade natural and untreated diamonds. As a De Beers subsidiary, Forevermark diamonds are sourced from mines that not only comply with their strict political, financial, social, and environmental requirements but also benefit the communities in which they are operating. The Forevermark Diamond Institute refers to their document as a Diamond Grading Report.
  • EGL (European Gemological Laboratory) USA’s main office opened in 1977 in the diamond district in New York and has established a reputation of fast turnaround time and fair grading standards and grades natural, synthetic and treated diamonds. E.G.L. refers to their report as a Certificate.
  • EGL International ­ founded in Belgium in 1974 and has a presence in most diamond exchanges throughout the world. EGL International is known to be more lenient in their diamond grading. E.G.L. International refers to their report as a certificate.

*Marks Jewelers is equipped with a long and short wave ultraviolet light box as well as a Sarin machine to determine the diamond’s fluorescence, polish, and symmetry.

  • July 17th, 2018 by Thomas

    My wife wanted something special for our wedding day. She asked Olivia what she could do with her mom's diamonds. Olivia took my wife's specs and said give us 4 weeks. In 4 weeks we were shown a model of what the ring would look like. We approved it and what she received was an amazing creation. It was beautiful. My wife was so happy on our wedding day and Mark's made it happen. Thank you to Olivia and the staff at Mark's. Highly recommend

  • July 17th, 2018 by Lisa

    Mark's offers a wide selection of jewelry and diamonds at all price points. The main reason I am giving 5 stars, however, is the staff. Liz C. was fantastic to work with. She designed absolutely gorgeous new settings for my engagement and wedding bands. She worked with me from concept through design, sizing and fulfillment, spending as much time as I needed to get my rings exactly how I want them! When I need any other jewelry, I would not hesitate to work with Liz again. I couldn't be happier with the process or the finished product!

  • July 11th, 2018 by Gabrielle

    I recently had to get 3 wedding rings resized, Mark’s did an amazing job! My engagement ring has a lot of small details on the back which looks seamless now with the resizing. The staff is amazing to work with. We will go back for all of our jewelry needs!

  • July 3rd, 2018 by Kim

    For me, the value of jewelry isn’t the price you pay, it is the meaning and sentiment attached to it that makes it invaluable. Mark’s has done just that. They customized two very sentimental pieces for me that are unique, one of a kind pieces. From a piece of colored glass to combining three diamond rings into one - their craftsmanship is top notch. I did not hesitate to entrust Mark’s with my wedding rings. I had a great experience working with their team from the design stage to receipt of the final product. I receive many compliments every time I wear my custom pieces. I HIGHLY recommend Mark’s Jewelers.

  • June 27th, 2018 by Peter

    I worked with Rina to purchase my engagement ring and she was nothing short of amazing! She took the time to educate me on the process of the four C’s, and we evaluated each diamond using that method. I couldn’t be happier with the way the ring turned out, and my fiancé feels the same. There was no pressure to move quickly with the purchase which was most appreciated and she made sure to stay within my budget; no up-selling.

  • June 21st, 2018 by Lindsey

    My husband bought my wedding band and engagement ring from marks 2 years ago and it’s still gorgeous and never had a problem! Everyone is incredibly sweet and very personable which makes the experience that much more of a pleasure. I had my ring resized this month and got it back today. It is absolute stunning and fits perfectly! They even cleaned it up so nice and shiney it was blinding.

  • June 19th, 2018 by Francis

    I couldn't have picked a better place to get an engagement ring. From start to finish, the process was stress-free.. and the team at Mark's was so easy going and extremely knowledgeable. I worked specifically with David, who provided exceptional service and really helped in my first jeweler experience. Also, his professionalism (as well as the entire team's) was top notch. I would recommend highly to all!

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