Each diamond, since mine until a finger of a woman, is always accompanied by a classification.
This classification is confidential and formulated in technical language when it is used by professionals in the market during transactions to let them to determine the quality of the diamonds quickly and efficiently. When the classification assumes formal character, it is called certification or gemological analysis.
Here we talk only about parameters to classify a polished diamond and not about criteria used to classify rough diamonds. The criteria for gemological analysis to allow you assign a value to a polished diamond, were defined in 1953 by the GIA (Gemological Institute of America). Educational institution nonprofit, the GIA was established in 1931 in Los Angeles by the jeweler Mr. Shipley with their savings. He considered absurd that traders involved in the chain of jewelry production did not know the main features about precious stones. Besides the gemological laboratory GEM LAB, the GIA is primarily concerned with education and releases the most prestigious diploma of the world in gemology “Graduate Gemologist” GG.
Gemological analysis should refer to the standard international classification introduced by GIA which can be summarized in the famous 4 “Cs”: CUT, CLARITY, COLOR and CARAT.
If we set 100 as price of a diamond, the cut counts for 40% and the other 3 Cs each for the 20%.
Certification or gemological analysis of a diamond is not an appraisal, but it is a means to allow a professional to get an estimate and it works like to the judgment of financial rating agency. So, especially for buyers who buy a diamond as investment, the gemological certificate joined to a diamond must be authoritative and internationally recognized or when you decide to sell your diamond you might have some bad surprise!
Diamonds often have with a laser inscription on the girdle of the stone to refer it to its gemological certificate.
Sometimes they are sealed to avoid to compromise the integrity of the certification, although in diamonds exchanges they are obviously traded always open and never sealed!
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