Gem Certification: Three gemstone laboratories everybody should know

One of the most important - though less glamorous - factors of fine jewellery purchasing is the certification that accompanies the diamonds and gemstones within the design. Particularly when buying engagement rings, solitaire rings and simplistic jewellery designs with one significant stone, the type of authentication and grading process which is provided should be a crucial part of your decision-making process.

There are several reputable gemstone laboratories in different countries which are worth knowing whether you are simply buying a piece of jewellery, investing in an important gemstone, or even looking to have an existing piece certified for selling. In the case of especially important jewellery which bears a historical significance or has an unknown provenance, often more than one of these institutions is employed simultaneously to ensure the highest level of certainty possible in certification. It’s also crucial to ensure that any piece of significant jewellery which you are considering purchasing (and conversely, if you’re selling too) comes with a recent certification from a reputable lab. The more recent the better, as technological advances in laboratory testing mean that a certificate from 10 years ago could easily be outdated and incorrect. So, if you need to have your jewellery certified, you can go to the three most known and respected laboratories…

Testing at a gem laboratory


The most known gem testing laboratory is, undoubtedly, the Gemological Institute of America, or GIA. It was founded in 1931 by Robert M. Shipley, and it asserts that its mission is “to protect all buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality”. In the 1920s, Robert M. Shipley was working as a jeweller. After completing the Great Britain National Association of Goldsmiths gemmological correspondence course, he returned to the USA and set about establishing the American equivalent for academic learning in gemmology. What followed was the legitimisation of gemmology as a profession, and the recognition of gemmology as a field of science. Since then, the GIA operates in four main areas: research, gem identification, diamond grading services and educational programs. Arguably the GIA’s most famous singular contribution to the world of gemstone classification is establishing the principle of the Four C’s within its International Diamond Grading System in 1953 - the standards by which diamonds are graded by more than half a century later.

Gübelin Gem Lab

One of the foremost authorities in coloured gemstone authentication - with particular focus on the provenance of gems, which can be determined through their unique visual characteristics - is the Gübelin Gem Lab. Founded in 1923 to examine and determine the authenticity of the stones used in Gübelin’s  jewellery; the idea behind this was to maintain the trust of Gübelin’s clients at the time. Now, the completely independent Gübelin Gem Lab is renowned as one of the most respected gemmological institutions of its kind in the world. The Gübelin Gem Lab provides highly respected Gemmological Reports - trusted by the world’s top auction houses, royal families, jewellers, gem traders, and collectors.


Another reputable source for gemstone certification is the Swiss Gemmological Institute known as the SSEF (Schweizerische Stiftung für Edelstein-Forschung). It was founded in 1974, and since then the laboratory issues reports for diamonds, coloured stones and pearls. The SSEF are often tasked with confirming the authenticity of gemstones, determining the gems origins, and detecting any possible treatments to the stones. Initially created for the benefit of the Swiss gemstone and jewellery trade, the SSEF laboratory then evolved to offering its services to private clients.

There are some other reputable laboratories worldwide like International Gemological Institute (IGI), European Gemological Laboratory (EGL), Danat Institute, but the examples shown here are the most famous and highly regarded amongst industry experts. In jewellery certification, the standing and perception of the laboratory is absolutely paramount, as authenticating gemstones is a complex subject.

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