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Know Your Diamonds, Part 1: Colorless Diamonds

Since the birthstone of April is the diamond, we thought spending some time this month blogging about the different aspects of these gemstones would be helpful for our customers. As one of the four c’s, color is incredibly important when selecting a loose diamond for use in fine jewelry. However, “color” can be a bit misleading. The most sought after diamonds are actually colorless. The reason for this is that colorless diamonds are less cloudy and therefore reflect more light. This is referred to as brilliance and fire in the industry, but most people simply refer to it as a diamond’s sparkle.

Defining Colorless Diamonds

The color of a diamond is rated on a scale from D to Z on the GIA scale. A diamond rated as a D would be considered completely colorless and therefore the most prized. However, colorless diamonds can also be rated E and F. The naked eye is unable to distinguish the amount of color in these diamonds. Moving down the scale, near colorless diamonds are rated G through J. These diamonds also appear to be without color to the untrained eye, but faint hints of other hues are detectable with precision instruments. For most people, near colorless diamonds are the best value. This is because people in everyday life will see a sparkling diamond without any color without paying full price for a truly colorless diamond.

colorless diamond examples
Examples of diamond color grading

What About Fancy Colored Diamonds?

While colored diamonds in the K through R range of the GIA grading scale are not desirable for fine jewelry due to their faint yellow tint, there are some diamonds with natural coloring that are actually quite valuable. These diamonds are known as fancy colored diamonds. Fancy colored diamonds are created when other elements are present during the creation of a diamond. For example, the presence of boron creates diamonds with blue hues while trapped electrons create pink diamonds. Even more rare, the presence of radiation manifests diamonds with green coloring. Diamonds with pure natural coloring are some of the most prized gemstones on the planet.

The Right Diamonds For Fine Jewelry

At Adiamor, we only carry diamonds graded between D and J. These colorless and near colorless gemstones are the best choices for creating fine jewelry and engagement rings. Colorless diamonds are the most valuable because they are more rare, but near colorless diamonds provide great value for the price. When deciding on what diamond is right for your custom jewelry, color is an extremely important aspect. However, it is only one of the four C’s, and factors such as cut, clarity, and carat weight should heavily factor into your decision.

Continue checking in with the blog this month as we explore more diamond related topics. For more information on diamonds right now, visit our Education Center today!

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When shopping for a loose diamond to complete one of our beautiful engagement ring or anniversary ring settings, one of the first decisions a consumer must make is the certification. Adiamor’s loose diamond selection is currently exclusively made up of certified diamonds evaluated by the GIA – Gemological Institute of America or AGS – American Gem Society.  We currently don’t offer EGL or EGL-USA – European Gemological Laboratory.


The result of your decision between a diamond from GIA or AGS vs EGL has a major effect on the characteristics of stones available to you, how much you spend, and how universally accepted your certification will be.

Who They Are

The Gemological Institute of America (GIA) and the European Gemological Laboratory (EGL or EGL-USA) are the world’s two leading gemological analysis laboratories.  AGS is a highly respected gemological lab, but not as commonly used as GIA.

All follow a rubric of diamond assessment that measures stones against an ideal version, but it was the GIA that first developed the “Four C’s” concept most people know of noting and ranking the four major traits of a diamond that make it the most attractive, strong, and valuable: cut, color, clarity, and carat weight. Once reserved only for the round brilliant diamond, over the years all three labs have opted to extend certification and grading services to include other popular diamond shapes such as the princess cut and cushion cut.

The GIA and the EGL are large diamond grading and certification labs but are markedly different in some key ways that often prompt jewelers and consumers to choose diamonds certified by the GIA.

What Makes GIA Different

GIA is known for having the most stringent and precise diamond grading standards in the world, granting high ratings to only the most superior diamonds that other labs including the EGL issue much more freely. This means that when two diamonds that receive comparable grading for cut, color, clarity, and other determinations of quality,  one from the GIA, and one from the EGL, the stone graded and certified by the GIA is invariably of higher quality than the stone receiving the same marks from the EGL.

GIA’s operations are broad in scope and geographically, featuring locations in all of the world’s major diamond-trading hubs. The organization also boasts educational campuses in 12 cities where educational certificate programs for aspiring gemologists, designers, and professional jewelers are offered. The best known of these is the GIA Graduate Gemologist certificate program, as many independent jewelers complete the course to develop proficiency in identifying all the factors making up a diamond’s quality according to GIA standards.

AGS was started in 1934 and has since grown to approximately 3,400 jewelers and other companies related to the jewelry industry.  AGS began offering diamond grading services in 1996.

EGL has fewer locations than GIA, operating labs or offices in a few European and Asian metropolitan areas and, independently through the EGL-USA, select major American cities. Formerly two branches of one organization, the original EGL, and the EGL-USA ended their association and began operating as unaffiliated organizations in the early 1980s.

Which Lab is Right for Me?

Adiamor’s customers ultimately typically purchase GIA certified diamonds compared to AGS due to the larger GIA inventory.  Both GIA and AGS Laboratories have excellent records and multiple methods in place to ensure transparency and accountability in all processes, so which lab certification an individual chooses depends mainly on which diamonds fit their criterion.

While GIA offers similar services in the way of grading, certification, and security, GIA has a much longer history than AGS or EGL. GIA was the pioneering agency in many techniques, processes, and innovations that served to make all competing diamond labs what they are today.

Additionally, the GIA operates as a non-profit while the EGL is a for-profit organization. This is an important distinction for many diamond buyers as the GIA’s non-profit status adds another layer of accountability and makes objectivity on the part of the gemologist much more likely. The general acceptance of GIA’s quality standards as superior to other laboratories may even be a direct result of operating this way; the outcome of each non-profit lab certification is the same for the gemologist regardless of his or her findings, and without the possibility of kickbacks, there’s no incentive to exaggerate or overlook a diamond’s defining characteristics during the analysis.

If simply having a certification and report attached to an aesthetically pleasing diamond or saving money is your priority, the EGL may be the way to go. Without the same history and resources the GIA can offer, the cost of EGL certification is slightly lower and allows consumers to purchase a more affordable certified loose diamond. The downside to this is that obtaining insurance or an appraisal for the diamond consistent with the information given on the EGL report can be challenging as the more critical GIA, or AGS standard is widely preferred.

Selecting a Certified Diamond

If you’ve chosen which certification you prefer and wish to proceed selecting a diamond, or if you have additional questions about the benefits and drawbacks of choosing a diamond from a specific lab, contact Adiamor. Our certified diamond specialists can guide you through the selection process, answer more specific inquiries not addressed above, and match you to the perfect certified loose diamond for the jewelry you’ve selected.

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Why Buy GIA Certified Diamonds?

Why Buy GIA Certified Diamonds?

Adiamor offers a variety of loose diamonds in every shape, carat weight, and quality grade imaginable for your selection as the center stone in any one of our exquisite engagement ring settings. To assure excellence and your peace of mind, every loose diamond sold by Adiamor includes certification by one of the world’s leading gemological labs: the Gemological Institute of America (GIA) or the American Gem Society (AGS).

GIA Diamond Certificate
GIA Diamond Certificate

Since Adiamor’s loose diamond inventory is primarily made up of GIA certified stones, in this post we’ll talk about the key differences and superior qualities that make GIA labs the most widely used and most trusted source of diamond certifications, but first let’s start with a summary of the advantages of purchasing a diamond certified by GIA.

The Main Advantages of buying a GIA Certified Diamond

  1. You know that the diamond you purchase is a natural diamond.
  2. You can easily compare stones due to the consistency of grading.
  3. You will know exactly what you are buying since every important attribute of the diamond is listed in the certificate.
  4. You will get what you pay for.

What is a Diamond Certification?

A diamond certification is a document  provided by the gemology lab to document the lab’s process of inspecting and grading the stone, and to serve as an official report on all identifying or otherwise notable features of an individual diamond. GIA certifications are available in varying levels of detail as diamond grading reports, diamond dossiers, and, most recently, diamond eReports.

To be certified by the GIA, a diamond must be unmounted and have a carat weight of at least 0.15.  To clarify GIA does not certify a ring just a diamond.  Some jewelers or jewelry stores may inaccurately tell you that a ring is certified.  It is possible that the ring has been inspected by a GIA graduate gemologist, but this does not make the ring or the center diamond certified by the GIA laboratory.

Why Choose GIA Certification?

The GIA is known worldwide as the most trusted, precise source for diamond certifications. GIA certification standards and quality grading ranges are the most rigorous of any of the major laboratories, and consequently carry the most added value and guarantee the highest diamond quality.  GIA achieves the highest level of consistency of any of the major laboratories in part by grading diamonds in a consistent environment in all offices including the same lighting, the same paint color on the walls, and the requirement for the graders to wear only certain colors when grading diamonds. As a non-profit organization, GIA maintains a standard of complete integrity and impartiality.

How Do I Know the Diamond and/or Certification is Genuine?

GIA certified diamonds are  laser inscribed with the unique report ID number to protect owners from fraud, and aid recovery in the event of a theft. This number matches the diamond to the report corresponding to its quality grade and identifying features.  Diamonds above 1 carat sometimes don’t have inscription since the inclusion pattern acts like a fingerprint to identify the diamond.

To prevent certificate forgeries and alterations, the GIA also places security features within the document itself including holograms, copy guards, and microprinting, the same features used to prevent fraud in financial institutions.

Thanks to these measures, you know what you are buying and what you will get.  Purchasing GIA certified diamonds online carries no additional risk compared to buying in a store due to the incredible consistency and the ability to validate you have the diamond you paid for.  Customers are assured of the diamond’s authenticity and the veracity of the associated report; consumers even have the option of verifying details directly with the GIA or with a third party gemologist.

Your Diamond’s Unique Features

Quality is determined and cataloged under the famous “Four Cs” of diamond grading: cut, color, clarity, and carat weight. Flaws in the diamond such as inclusions, clouding, pits, and poorly cut facets are noted in both the written report and in an illustration of the diamond showing the location and severity of each flaw.

The diamond’s weight is recorded using a state-of-the-art electronic micro-balance scale that provides an exact measurement to five decimal places, and color grade is determined in a standardized viewing environment. Your GIA certification will also evaluate qualities like the stone’s  polish and symmetry each of which are taken into account for the final overall quality assessment recorded in your diamond’s report.

GIA – The Worldwide Standard for Evaluating Diamond Quality

GIA established the “4Cs” in the 1940s which has become the worldwide standard for evaluating diamond quality.  So if you believe in using the 4Cs to evaluate and compare diamonds you already have some knowledge of and trust for the GIA Laboratory and its certification process.

To learn more about GIA certified diamonds or for assistance in choosing a stone, contact Adiamor’s expert team of gemologists.