American Gemological Laboratories

American Gemological Laboratories (AGL) is the United States' most widely known and respected colored stone gem identification and quality-grading laboratory. It was founded in 1977 and became the first gemological laboratory in the US to provide quality grading as well as country-of-origin determinations for colored stones. AGL has become an iconic brand for uncompromised standards and excellence in gemstone reporting (www.aglgemlab.com).