Why Shane Co. Uses Multiple Grading LabsIn addition to grading all of our diamonds ourselves, Shane Co. also uses several of the world’s leading independent diamond grading laboratories. Some labs tend to be looser or stricter when grading Cut, Color and Clarity, and some are more consistent in applying their standards than others. Therefore, if different labs were to grade the exact same diamond, they would typically give the diamond different grades. By using multiple labs, Shane Co. ensures that our own grading standards reflect a balance of the prevailing global standards. Remember, of the Four Cs, only Carat Weight is factual, while clarity and color are simply an educated opinion by an individual. Our rigorous approach to grading ensures that we consistently provide our customers with accurate and reliable diamond grades.
GIA - Gemological Institute of AmericaThe GIA created the 4 Cs grading system. GIA is known for having the strictest grading standards of the leading labs and is also the most consistent. The GIA certificate is considered the benchmark to which all others are compared.
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IGI - International Gemological Institute The IGI tends to grade diamonds looser in color and somewhat looser in clarity compared to GIA. The IGI is consistent in its grading standards.
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AGS - American Gem SocietyThe AGS was the original lab to provide diamond cut grades and uses its own cut grading scale from 0 to 9. The AGS’s grading standards are nearly comparable to GIA’s grading standards. AGS has an excellent reputation for consistency.
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GSI - Gemological Science International
The GSI's grading standards and consistency are similar to those of the IGI and the GIA.
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EGL - European Gemological Laboratory (USA)The EGL typically has looser diamond grading standards compared to GIA standards, although not as loose as EGLI.
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EGLI - European Gemological Laboratory InternationalThe EGLI generally has looser diamond grading standards compared to GIA standards. EGLI consistently grades diamonds 2 to 2.5 total grades higher than GIA. For example, a difference in color of one grade higher + a difference in clarity of one grade higher = a two-grade higher difference.
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