A world leader in coloured gemstone, diamond and pearl testing
Get your items tested by us.
- Fast shipping and safe door-to-door delivery
- On-site testing in Bangkok, Hong Kong and USA
- Easy order and secure payments by credit card
- SSEF Report verification*
*Verify your SSEF report and download a digital copy at www.myssef.ch
Upcoming on-site testing
Get your gems tested during in Bangkok, Hong Kong and the United States.
SSEF Scholarship recipients 2025
This year, Ravenya Atchalak (Thailand) and Krishnadeo Seechurn (Mauritius) have been selected for the Prof. Henry A. Hänni and the George Bosshart scholarships. Congratulations to them!
Celebrating 50 years of SSEF
Some 150 industry leaders and opinion-makers from around the world gathered in Basel to celebrate the golden anniversary of SSEF.
Auction highlights
A selection of remarkable jewels recently tested by SSEF and sold at auction.
*Images: Phillips
Become a gem expert
Since its successful beginning in 2001, SSEF’s education department has offered a broad spectrum of gemmological courses to thousands of students from industry, trade, and academia.
Discover our courses
- All levels of gemmology
- Large course collection of stones
- Leading gemmologists as lecturers
- Highly practical courses in small groups
We also provide tailored courses for individuals and companies.
Free online courses by SSEF
Understanding Gemstones
Start your journey to becoming a gem expert with these introductory online courses.
Facette
Facette is the annual magazine of the Swiss Gemmological Institute SSEF. 2024 marks its 29th issue. Starting as a humble leaflet with a few black & white pages in a very basic layout, Facette has evolved into a magazine rich in information about recent research findings and activities at SSEF.
Research at SSEF
Since its beginnings over 50 years ago, the Swiss Gemmological Institute SSEF has been a driving force and at the forefront of scientific innovation in gemmology. Our dedication to gemstone scientific research is an important foundation to our expertise and reliability in testing.
Hundreds of publications, presentations and much more!
Also follow our latest research in:
Visit of the Letšeng diamond mine in Lesotho
In November 2025, Dr. Michael S. Krzemnicki and Dr. Michael Mintrone, Head of the Diamond Department at SSEF, were invited to visit the Letšeng diamond mine in Lesotho as part of a collaboration project. The Letšeng diamond mine is known for its large diamonds of exceptional quality and is the highest diamond mine (at 3200 […]