The GIA (Gemological Institute of America) are the world’s foremost authority on the certification of diamonds. The GIA is a nonprofit-making institute dedicated to research and education in the field of gemology and the jewellery arts. Founded in 1931, the GIA’s mission is to protect all buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality.

The institute does so through research, gem identification and diamond grading services and a variety of educational programs. Through its world-renowned library and subject experts, GIA acts as a resource of gem and jewellery information for the trade, the public and worldwide media outlets.

Gubelin Laboratories in Lucerne, Switzerland, have forged a reputation as the preeminent body for the certification of Emeralds and other gemstones. Founded in 1850, they are one of the oldest and most highly respected certification institutions in the world.


“CDTEC´S professional team is specialised in very diverse and specific technological processes, which are fundamental in the assessment, tradition and authenticity of Colombian gems.”

Based in Bogotá, Colombia, and with their finger on the pulse of the fine emerald trade, CDTEC have developed a reputation at the forefront of gem certification.



SSEF is a Swiss gemmological institute founded in 1974 and part of the Swiss Foundation for Gemstone Research, specialising in coloured gemstones.  Its forte lies in the detection of gemstone authenticity, origin and gem treatments.  It offers expert independent advice to a wide gemmological clientele including gem dealers, collectors and auction houses.