The American Gem Society Laboratory (AGSL) and the Gemological Institute of America (GIA) Gem Trade Laboratory (GIA-GTL) set the standard by which all other gemological laboratories are compared, but are the two gemological laboratories truly equal when it comes to the standards by which they grade diamonds? Both the AGSL and the GIA are Heavy Weight Contenders which command the highest respect throughout the industry, and they are extremely well matched in terms of the grading standards which they use to grade diamond carat weight, clarity, color, fluorescence, polish and symmetry. Learn the differences between the GIA Excellent and AGS Ideal-0 cut grading systems by reading this article.
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