There are many diamond labs that issue certificates, but the Gemological Institute of America (GIA) and the American Gem Society (AGS) are the two most widely regarded and recognized diamond grading labs in the world.
Note : all diamond certificates are created equal. If you do opt to buy non GIA- or AGS- certified diamonds, always ask for credentials of the certifying lab.
And while there are many other diamond grading labs in operation (many of which produce their own grading reports), dfferent labs have different grading standards, and some labs will be more lenient with their standards than others. Therefore, we recommend buying from a diamond jewelry store that offers GIA or AGS certified diamonds, as these labs have consistently demonstrated their commitment to high standards. If you do elect to buy non GIA- or AGS- certified diamonds, always ask for credentials of the certifying lab.
