What Does a Gemologist Do?


One of the most recognized titles in the diamond industry is a graduate gemologist, or G.G. They are the trusted experts for accurately identifying and grading the unique characteristics of diamonds and colored gemstones. Learn more about how gemologists develop their specialized skill set, and how their professional assessment of your diamond jewelry plays an important role in determining its true value.

A critical step in selling your diamond jewelry is to understand the quality and characteristics of your diamond. While the 4Cs (cut, color, clarity, and carat) are a good place to start, there are many other important characteristics such as fluorescence, symmetry, and polish that need to be assessed and graded to determine the value of your stone. But how do you ensure your diamond is being accurately assessed? Who are the trusted experts in diamond grading?

When it comes to selling your diamond jewelry, turning to the expert opinion of a graduate gemologist is a wise choice. A graduate gemologist is one of the most recognized titles within the industry. Having gone through much training and held to the highest standards of diamond grading, these individuals are trusted to accurately identify and grade a diamond’s unique attributes that will help determine its true value.

Through their professional assessment, graduate gemologists play an important role in determining the value of your diamond. That is why from the time your item is submitted online to the moment you get paid, the graduate gemologists that comprise Mondiamo’s client care and pricing teams ensure your diamond is accurately assessed to provide you with exceptional service and the highest offer.

What is a graduate gemologist: The basics

A graduate gemologist has studied the academic and practical science involving diamonds, colored gemstones, pearls, and precious metals. This degree is held to rigorous standards, led at the highest level by the Gemological Institute of America (GIA). Globally acknowledged as the industry’s top program of study, the Graduate Gemologist (GG) designation means that a person has gone through an intense series of classes and laboratory time and is expected to work per GIA diamond grading practices upon graduation. A graduate gemologist from the GIA is one of the most trusted titles in the industry.

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A study in diamonds and gemstones

Part of what makes graduate gemologist such a respected title is the rigorous studies that gemologists must partake in. At the GIA, students are required to spend a minimum of 780 hours performing their coursework and accurately identify more than 1,000 diamonds and colored gemstones throughout their studies. The skills taught include:

  • The ability to identify and grade diamonds in an efficient, accurate and consistent manner
  • Build a knowledge base of colored stones and the colored gemstone market
  • Identify gemstone characteristics, and simulants and treatments
  • Understand how color, rarity and quality affect the value
  • Recognize how market factors affect diamond and gemstone values

Their learning culminates in a final exam in which they have to identify 20 stones with absolutely no error. They must classify the stone’s species and variety (diamond, beryl, corundum), color (both hue and saturation), and treatment, among other characteristics, and if they inaccurately identify any aspect of the 20 stones, they don’t pass the course and must retake the exam.

It’s a challenging degree, but with this experience, it’s easy to see why graduate gemologists are trusted for their diamond and colored gemstone expertise. Their knowledge and understanding of a diamond’s unique characteristics are unparalleled.

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Consult the experts when selling your diamond jewelry

Without a professional assessment by a graduate gemologist using the right equipment, there is a risk your diamond jewelry will be incorrectly identified, and you will receive an offer for your diamond that is under market value. While many local jewelers or pawn shops may have a graduate gemologist on-staff, they may not have all the tools and equipment readily available to properly evaluate your diamond’s unique characteristics and quality.

With acute attention to detail and a set of tools that includes high-power microscopes, handheld loupes, and other advanced lab equipment, our graduate gemologists accurately inspect every diamond to assess its unique characteristics. They work with a diamond cutting expert and use advanced technology to find ways to enhance the value of a client’s diamond by re-cutting it to improve its color and/or clarity.


At Mondiamo, we pride ourselves on working with the best the industry has to offer. All of our gemologists are not only graduates from the GIA, but also have decades of experience helping clients in both the diamond retail and buyback markets. This combined knowledge of people and product allows them to provide outstanding service to our clients, while truly understanding the value of their diamond. They are the experts at assessing the beauty of a diamond, how it relates to pricing and the diamond’s desirability in the market, and they are here to ensure our clients receive the best possible offer.

When it comes time to think about selling your diamond jewelry, trust someone with the right set of special skills and competence to handle your pieces with integrity and expertise. Our team of graduate gemologists works hand-in-hand with our expert diamond buyers to assess your diamond’s quality. Using our proprietary pricing algorithm, we are able to provide you with the best value for your diamond jewelry. This way, you can feel confident in your decision to sell your diamonds for the maximum value. Mondiamo is here to help you with complete transparency about your diamond, its value, and any other questions you may have at every step of the way.