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Therefore, if different labs were to grade the exact same diamond, they could give that same 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 cut, 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. Diamond Certification Laboratories GIA - Gemological Institute of America The 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. Go to GIA website 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.