GRS GemResearch Swisslab AG
The trade uses GRS for origin determination, treatment classification and colour terminology on ruby, sapphire, emerald and other coloured stones.
The record
What it covers
Reports it publishes
Named as the laboratory names them on its own site. Report contents and wording are set by the laboratory, not by us.
- GRS Gemstone Report - The Original
- Gemstone Enhancement Disclosure
Worth knowing
Founded by Dr Adolf Peretti. GRS applies proprietary colour descriptions such as GRS-type pigeon's blood and GRS-type royal blue, which are the laboratory's own terminology rather than an industry-wide standard. Laboratories operate in Switzerland, France, Hong Kong, Thailand and the United States.
Compiled from gemresearch.ch, read on August 16, 2026.
We verify dealers, not stones. A laboratory report describes one stone on one date; it is not a guarantee of value, and it is not ours to stand behind.