All of our stones are certified by one (or more) of the world’s leading gemmological laboratories. This is essential to demonstrate the origin and the key characteristics of a gemstone.

These detailed reports accompany each stone at all times and they are easily verifiable. The main four laboratories that certify the stones we supply are described on this page. They are fully independent and completely impartial. Follow the links below each icon to explore their websites and find out more about them.

The GIA (Gemological Institute of America)

The GIA are the world’s foremost authority on the certification of diamonds and other gemstones. The GIA is a non-profit making institute dedicated to research and education in the field of gemmology 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.

Gübelin Laboratories

Based in Lucerne, Switzerland, Gübelin 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.  Indeed their founder, Dr Eduard Gübelin, is said to be the “father of modern gemmology.”


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.