Loose diamonds are sent to a 3rd party laboratory for a comprehensive evaluation this process is known as diamond certification. A diamond certificate or a grading report provides an expert opinion on the quality of the diamond and is provided by the world’s leading gemology labs including GIA, AGS and IGI etc. Trained gemologists with specialized equipment measure the weight and assess quality characteristics such as cut, color and clarity.
A certificate showcases individual characteristics of diamond and very useful to identify a right stone. When shopping for a loose diamond, keep in mind that stones that have a grading report will help you make an informed decision on the diamond that is right for you.
Laboratory certification provides an impartial judgment of the characteristics and quality of diamond. Each diamond certificate issued is uniquely numbered and corresponds to individual diamond. The diamond certificate is also valuable for insurance purposes, as it provides a professional evaluation of the diamond.
Most common independent certification laboratories:
GIA - Gemological Institute of America
AGS - American Gem Society Laboratories
EGL - European Gemological Laboratories
IGI - International Gemological Institute
These laboratories have an excellent reputation in US market for providing accurate and consistent unbiased diamond reports. You should always ensure that a grading report from an independent diamond laboratory be a part of your purchase.