How Diamonds Are Certified

If you're thinking about purchasing loose diamonds or diamond jewelry, it's a very good idea to make sure that such diamonds are certified diamonds. Such diamonds are accompanied by a document known as a "grading report," which is not the same thing as an appraisal. While an appraisal can give you an idea of the monetary value of your certified diamonds, it is this grading report that is the basis of this valuation.

How Diamonds are Certified

The grading report describes certified diamonds on the basis of four qualities. These are carat, clarity, color and cut, and therefore are sometimes known as the "Four Cs" of certification. The report is for the benefit of those who create and market diamond jewelry, as well as those who purchase it - either as collectors, investors or both.

Those who prepare such reports are known as gemologists. These are technicians who generally have a degree in geology, then go on for specialized training in the study of precious gems and stones; they are to field of geology what cosmetic surgeons are to the field of medicine.

What the Grading Report Contains

Three of the criteria used to analyze and evaluate diamonds are thoroughly objective, meaning they can be readily measured and quantified. Carat of course is a measure of mass and weight; a carat is equal to 2 decigrams, or roughly 1.5 hundredths of an ounce. Obviously, the more a gem weighs, the greater its value.

With industrial diamonds, the process might stop right there. However, certified diamonds are those used in diamond jewelry, and thus must be pleasing to the eye. The SI Clarity Grade is another criterion by which gemologists evaluate diamonds. The ideal, perfect diamond is rated "FL" for "flawless." The stone is virtually clear, with no cloudy or "cottony" areas or visible cracks. Stones that are clouded and/or cracked are labeled "I3" for "imperfect."