- American Gemological Laboratories Founded in 1977, and located in the heart of New York’s gem and jewelry district, American Gemological Laboratories (AGL) is an international gemstone testing facility specializing in comprehensive colored gemstone analysis.
- International Gemological Laboratories IGL Laboratories are respected diamond grading laboratory. We have pioneered the development of the first scientific system used to evaluate how well a diamond has been cut. A diamond’s cut is the most important C of all of the four C’s.
- EGL Each EGL USA Gemological Report provides a clear, concise view of your stone. So, it’s more than an
- GIA Established in 1931, GIA is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry.