Gubelin Gemmological Laboratory keeping our gemstone report with traditions high standards, independent opinion of the laboratory, constant inovation and up to ...
GemResearch Swisslab (GRS) has invented its own high technology portable gemmological laboratory, computerised and with state-of-the-art spectrometers. GRS Heat ...
Sterling Gemological Services offer a full range of appraisal services. Our laboratory is fully equipped with all of the more recent innovations in gemological ...
