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Certified Loose Diamonds
Certified Loose Diamonds by EGL
The European Gemological Laboratory (EGL) is one of the most respected and prestigious independent gem appraisal institutes in the world. It was established over thirty years ago in Belgium, and now has offices in key cities around the world. Its New York office, established in 1977, is considered its North American headquarters.
EGL Diamonds - European Gemological Laboratory (EGL)
EGL has been considered one of the key innovators in gem appraisal, having developed several methods of scrutinizing the quality of diamonds. It was the first lab to grade diamonds weighing less than one carat. It also introduced the "S13" designation for establishing clarity now accepted and used by the diamond industry and gemological laboratories around the world.
EGL Diamond Grading Process
A team of 8 experts, including 4 trained and experienced gemologists, looks at every diamond submitted to EGL. They then implement a series of tests.
First, the diamond is weighed and measured, and its culet and girdle thickness measured with very precise instruments. Then it is placed in a specially lighted room (which has been scientifically calibrated for exact results). Here, the team looks at the stone's color, by comparing it to a set of master diamonds. At least 3 experts must agree on the color grade for the results to be official.
In order to check for clarity, the diamond is examined with a special zoom binocular microscope. The experts look at all of the diamond's facets, scrutinizing for blemishes and inclusions. These are then mapped on a diamond diagram also referred to as a diamond plot.
The diamond is then tested for polish and symmetry, which are indications of the skill and craftsmanship of the cutter. The team checks proportions, and measures the brilliance of the stone.
EGL also offers a service that can allow buyers to identify or embellish very precious stones. This is the Diamond Laser Script service.
Using high-precision instruments, EGL can inscribe the EGL certificate number on a diamond, along with key information like the weight, color and clarity grade. Clients can also write their name or personal messages (even "Happy Anniversary!").
EGL Diamond Grading Courses
Diamond enthusiasts and jewelers can now attend the EGL's Diamond Grading Courses. The institute combines both a theoretical and practical approach, tackling the various aspects of diamond appraisal. It also discusses the transformation of a raw diamond to a polished one, with hands-on practice on how to grade a stone.
The Diamond Grading Courses are offered in Israel, but there are also correspondence courses. The classes are taught in several languages and are open to jewelers, gem enthusiasts and other people in the diamond industry. At the end of the course, the participants are given an EGL Diploma.
The 4 most trusted names:
- International Gemological Institute (IGI)
- The Gemological Institute of America (GIA)
- The American Gem Society (AGS)
- The European Gemological Laboratories (EGL)
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