GSI Offers First “Combined” Grading and GemEx Light Performance Analysis Report

“Utopia,” Says One GemEx User About the Innovative Joint Report

Gemological Science International (GSI) and GemEx have introduced a combined report that offers the classic 4Cs, plus other physical features of the diamond, along with the resultant benefits of those features, defined by GemEx as the actual light output of the diamond.

“This is the first time that a grading report shares top billing with light performance analysis based on GemEx’s photospectromic technology,” said GSI CEO Mark Gershburg.

“I’ve been waiting for this for years,” said Gary Gordon, CEO of Samuel Gordon Jewelers, who was the first high-end jeweler to embrace the GemEx technology in 2000.  “The GemEx report is so important to us, and our customers understand it.  To wrap up everything in one nice, neat package is utopia.”

Until now customers who wanted to offer both a grading report and GemEx have had to order the two separate documents directly from the diamond manufacturer.   A combined GSI/GemEx report offers convenience to everybody in the supply chain, said Gershburg.  GSI is also the only lab that can scan a diamond using GemEx equipment.

“We believe that the combined GSI/GemEx report will help take diamond selling to the next level,” said Randall Wagner, President/CEO of GemEx, which owns the worldwide patent on a diamond imaging spectrophotometer.  “GSI and GemEx share a commitment to innovation, which is one of the reasons I’m delighted to work with them on this initiative.  It is a giant step forward for the diamond industry,” said Wagner.

Gershburg concurs.  “GSI is offering GemEx light performance analysis on its reports because the combination of gemological data with light performance allows the consumer to have a more complete view of a diamond and to focus on its artistry and beauty,” said Gershburg.  “It’s romancing the diamond but in a scientific way that consumers easily relate to.”

The lab offers the combined report in a variety of formats from full- to credit-card sized, along with customized designs. The report is fully digitized, including digital plotting, which GSI recently introduced in its reports.  Like all GSI reports, the actual combined report can be viewed online 24/7, as soon as it is printed, at its website,  The combined report can also be viewed 24/7 on

Each GSI/GemEx combined report comes with a “how to read” guide and other marketing support.  Additional materials, including packaging and a viewer, are available from both GSI and GemEx.

GemEx is the inventor and the worldwide leader in the measurement of light performance of diamonds.  GemEx uses patented imaging spectrophotometer technology that measures how well a diamond refracts and focuses light. The actual light output of the diamond is measured based on the three components of light performance:  brilliance, fire, and scintillation.  GemEx is headquartered in Mequon, WI USA, and has offices in India and Hong Kong. See

GSI is a full-service gem lab whose clients are mainly large manufacturers, major jewelry chains, department stores, and online jewelers.  It is headquartered in New York City’s Diamond District at 581 Fifth Avenue and has an office in Mumbai, India. Visit or call Debbie Azar at 212-207-4140 Ext. 202.

Click here to view a sample report.

About the author

Co-founder & President at Gemological Science International (GSI) | +12122074140 | Website | + posts

Debbie Azar is an experienced executive with extensive knowledge of the jewelry and gem lab industries. Her entrepreneurial skills and clarity of vision have helped GSI achieve rapid and continuous growth worldwide.

She began her industry career by starting her own successful costume jewelry business. She then expanded her knowledge of the industry with sales, marketing and business development roles at several companies. In 2005, she joined Mark Gershburg to establish GSI. Ms. Azar is an active member of myriad industry organizations and charities; she currently serves as a Board Member of Jewelers for Children. She is also a Forbes Business Council member.

Her strengths include working directly with retail chains and stores to help build their business and brands. She is widely known in the industry for her commitment to meeting customer needs.

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Where is Gemological Science International (GSI) located?

GSI is headquartered in New York, NY. It has 13 laboratories on four continents and in a number of countries: the United States, India, Dubai, Israel, Belgium, Hong Kong, and Botswana. This makes GSI one of the largest independent gemological organizations in the world.

Is there a difference between grading reports issued by different GSI laboratories?

All GSI laboratories grade using the same methods and adhere to the same standards. Every laboratory is staffed with highly trained professionals who have years of grading experience and an extensive gemological background.

What does it mean when a sales associate tells me my diamond is “GSI Certified” or is accompanied by a “GSI Certificate”?

The phrases “GSI Certificate” and “GSI Certified” are industry shorthand for GSI grading or identification reports. What this means to you is that expert gemologists and trained professionals meticulously evaluated the item. When your diamond, jewelry or gemstone is accompanied by a GSI grading report, you can be completely confident in the accuracy and objectivity of the evaluation.

Where can I find “GSI Certified Diamonds”?

GSI diamond grading and identification reports can be found in jewelry stores worldwide and online. Insist on a GSI grading report when shopping for a diamond, jewelry or gemstone.

What do I do if I lose my GSI Diamond Report?

Every GSI grading report is available on our website. Please visit and go to “verify your report”. Enter your GSI report number and you’ll instantly have access to a digital copy of it. You can also email us through the website to request a copy.

What are the 4Cs

A beautiful diamond is one of nature’s most mesmerizing creations. But how do you objectively judge the quality of the gem? The 4Cs – Cut, Color, Clarity, and Carat Weight – are the universal standard for doing this.

Is there anything beyond the 4Cs?

The 4Cs are an essential and important description of a diamond’s characteristics. But there is a considerable amount of detailed information behind each “C” along with other qualities of a diamond that affect its beauty, such as fluorescence, light performance and more.

How much do you need to know? That’s up to you, but knowing the 4Cs is almost essential.

What does a GSI diamond grading report look like?

GSI offers a number of grading reports (often referred to as “GSI Certificates”). You can see samples of them by browsing the Grading Reports page on our website.

What does a GSI colored diamond grading report look like?

You can see samples grading reports by browsing the Grading Reports page on our website.

What does a GSI Colored stone report look like?

You can see samples of Colored stones reports by browsing Grading Reports page on our website.

How does a GSI grading report compare to other laboratories that issue grading reports?

It is our policy not to comment on other laboratories. However, know that GSI adheres to the highest ethical standards. We do this in a number of ways:

  • Rotating gemologists to our different labs
  • Continuously upgrading our proprietary grading software to ensure full compliance with international grading standards
  • Having our gemological research department constantly investigate new developments in the industry, which informs the grading process

What’s the difference between a “GSI Certificate” and a “GSI Diamond Grading Report”?

GSI issues a variety of grading and identification reports. Consumers and industry professionals often call these reports “GSI Certificates”.

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