Certification
GRS GemResearch Swisslab: What Its Reports Cover
GRS is a Switzerland-based laboratory known for detailed origin and treatment reports on coloured gemstones such as ruby, sapphire and emerald.
Specialisation in coloured stones
GRS focuses heavily on coloured gemstone identification, including geographic origin determination and treatment analysis for stones such as Burmese ruby or Kashmir sapphire.
Origin and treatment terminology
GRS reports use specific terminology for treatment severity (such as indications of heat with or without additional treatment) and often include a GRS Type grading for certain gems, which buyers should learn to interpret rather than assume is a simple pass or fail.
Verifying a report
As with any lab, buyers should confirm a GRS report's authenticity and that it matches the stone in hand, generally through the issuing lab's own verification channel or by requesting re-examination.
Buyer checklist
- ✓ Confirm the report's stone measurements match the physical gem
- ✓ Understand GRS treatment terminology before assuming 'no indication of heating'
- ✓ Ask for origin opinion wording, since labs state origin as an opinion, not an absolute fact
Verification tools & references
Every Riakoob piece arrives certified, insured and covered by our 12-month value promise.
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