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Gubelin & SSEF Agree to Harmonize Standards
Bern: The Swiss-based Gübelin Gem Lab and Swiss Gemmological Institute SSEF, recognized as the leading laboratories for coloured stone testing, have agreed to harmonize their
Bern: The Swiss-based Gübelin Gem Lab and Swiss Gemmological Institute SSEF, recognized as the leading laboratories for coloured stone testing, have agreed to harmonize their
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