Why Shane Co. Uses Multiple Grading Labs
In addition to grading all of our diamonds ourselves, Shane Co. also uses several of the world’s leading independent diamond grading laboratories to provide a 3rd party evaluation for many of our diamonds. For diamonds graded by an outside laboratory, a copy of the report is included online and with your purchase.
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.
Go to IGI website >
AGS - American Gem Society
The 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.
Go to AGS website >
GSI - Gemological Science International
The GSI's grading standards and consistency are similar to those of the IGI and the GIA.
Go to GSI website >
EGL - European Gemological Laboratory (USA)
The EGL typically has looser diamond grading standards compared to GIA standards, although not as loose as EGLI.
Go to EGL website >
EGLI - European Gemological Laboratory International
The 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.
Go to EGLI website >