About Us

Total commitment to understanding consumer concerns has motivated GIL to develop comprehensive analysis and clear documentation for consumers. This empowers jewelry buyers to focus on finding precisely what they want, with full assurance in the integrity and quality of the GIL certification.

Gemological International Laboratories (GIL) is an international gemstone testing facility specializing in comprehensive diamond and colored gemstone analysis. GIL provides detailed identification and enhancement reports, country-of-origin reports, as well as complete colored stone analysis documents. The Laboratory is equipped with state-of-the-art instrumentation, and applies standard gemological, as well as advanced analytical, techniques to each determination it makes.