There are two popular diamond certification laboratories; International Gemological Institute or IGI and the Gemological Institute of America or GIA.
Lab diamonds often come with an IGI certificate, which is issued by the International Gemological Institute. This renowned institute has operated since 1975 and is the biggest independent gemological laboratory worldwide. They offer comprehensive reports for lab diamonds and also certify natural diamonds and colored gemstones. The IGI is known for being the first major organization to certify the color and cut of lab-grown diamonds.
The Gemological Institute of America, commonly known as GIA, is the leading organization for assessing the quality of diamonds. Established in 1931, GIA operates as a non-profit entity renowned for its research on precious stones and reports of natural diamonds. The standards set by GIA are widely regarded as the most stringent compared to other grading bodies, such as the IGI.