Trust is good, control is better!
Important Certification Bodies for Gemstones
| Certification Body | Abbreviation / Full Name | Country / Location | Short Explanation |
|---|---|---|---|
| GIA | Gemological Institute of America | USA (Carlsbad) | The world’s most well-known and influential laboratory. Very strict and consistent evaluation of color, clarity, cut and treatments. Standard for diamonds and colored stones. High acceptance in international trade and among collectors. |
| SSEF | Swiss Gemmological Institute | Switzerland (Basel) | One of the most renowned laboratories for colored gemstones. Specialized in detailed origin determination, treatment detection and scientific analyses (e.g. GemTOF). Highly regarded especially for high-quality rubies, sapphires and emeralds. |
| Gübelin Gem Lab | Gübelin Gem Laboratory | Switzerland | Traditional Swiss laboratory with high expertise in colored stones. Known for precise origin and treatment analysis as well as very detailed reports. |
| IGI | International Gemological Institute | Belgium (Antwerp) | Internationally widespread, somewhat more accessible than GIA. Good alternative for colored stones and diamonds. Often used in the trade. |
| HRD | Hoge Raad voor Diamanten | Belgium (Antwerp) | Originally strongly focused on diamonds, but also issues certificates for colored gemstones. High reputation in Europe. |
| AGS | American Gem Society | USA | Known for very strict cut grading (especially diamonds), but also used for colored stones. |
| EGL | European Gemological Laboratory | Various countries | There are several EGL laboratories (EGL International, EGL USA etc.). Quality varies more than with GIA or SSEF – therefore less respected in the premium segment. |
Tip for the trade and collectors: For high-quality colored gemstones (rubies, sapphires, emeralds etc.), GIA and SSEF are considered the “gold standard”. For absolute top pieces, both laboratories are often used in parallel.
The UID Procedure (Unique Identification / Laser Inscription)
What is UID on gemstones? UID stands for Unique Identification Number (a unique identification number). It is a microscopically small, permanent laser inscription applied to the girdle (the narrow edge) of the gemstone.
How does the procedure work?
- The gemstone is analyzed in the laboratory and a detailed certificate report is created (with all relevant data: weight, color, clarity, treatments, origin, etc.).
- The laboratory assigns a unique report number (e.g. GIA number or SSEF number).
- Using a high-precision laser, this number (sometimes also a logo or short message) is engraved invisibly to the naked eye on the girdle of the stone. The inscription is only visible under 10x or greater magnification and is extremely shallow (usually only 2–5 micrometers deep).
- This permanently and tamper-proof links the stone to its certificate.
Advantages of the UID procedure:
- Fast and unambiguous identification of the stone (even years later)
- Protection against mix-ups or fraud
- Easy online verification: Enter the engraved number on the laboratory’s website to immediately receive the original report
- Increases value retention and trust in wholesale and among collectors
- Considered one of the most effective tamper-proof features
Which laboratories offer this? Almost all major laboratories such as GIA, IGI, SSEF, Gübelin, HRD and GCAL offer laser inscription – usually optional or standard with certain reports.