GTLI Diamond Reports are issued for diamonds of any size; a plotted diagram of the characteristics and a graphic representation of proportions appear on many of our documents.

GTLI Diamond Reports have different formats and presentations, customized to serve a wide range of consumer demand in our different worldwide markets. Regardless of format, every GTLI Diamond Report is issued according to the strict international standards and security features for which GTLI is known.

GTLI Diamond Reports give an accurate assessment of a diamond's cut, color, clarity and carat weight according to strict international standards.

Diamonds with permanent treatments are certified with such treatments noted prominently in the comment section of the report. GTLI Diamond Reports are not issued for diamonds with non-permanent treatments.

Gemstones should only change hands when accompanied by a certificate attesting to quality. Regardless of location or marketplace, an authentic GTLI Laboratory Report is the common language of trust and confidence in the gemological world.