Gemstone StudiesBack to laboratory facilities

From its existence, GSI entered into Gem Testing as an aid to render public service during mid sixties. From a humble beginning it has grown into a leading center of gem testing in the country instilling consumer confidence among one and all. The Gemmology Laboratory of GSI assumes a special significance with the booming gemstone business getting mixed up with synthetics, simulants and imitation stones .GSI provides commercial service for identification, authentication and certification of the gemstones. The Mineralogical Report is prepared based on the non-destructive analysis of the gemstones. It comprises essential physical and optical constants along with internal inclusion pattern to arrive at the name of the mineral and its gem variety. The report also indicates a qualitative assessment of the gemstone based on 4 ‘Cs’ (Cut, Carat weight, Colour and Clarity). Special characters like spectroscopic result, optical effects and external flaws are mentioned under the heading ‘Other Characters’ of the report.

Gem samples as received for testing

Standard Operating Procedure

NCEGR, Kolkata Additional Director General National Mission Head-IV Central Headquater Geological Survey of India 15 A & B Kyd Street Kolkata-700016 FAX- 033-22861716 Email-hodm4@gsi.gov.in

GSI, CR, Nagpur Additional Director General & HOD Central Region Geological Survey of India GSI Complex,Seminary Hills, Nagpur-440006, Maharashtra FAX-0712-2511671 Email-hod.cr@gsi.gov.in

GSI, SR, Hyderabad Additional Director General & HOD Southern Region Geological Survey of India GSI Complex, Bandlaguda, Hyderabad-500068 Andhra Pradesh FAX-040-24220958 Email-hod.sr@gsi.gov.in

GSI, WR, Jaipur Additional Director General & HOD Western Region Geological Survey of India GSI Complex, Khanij Bhawan 15-16, Jhalana Dungri, Jaipur-302004, Rajasthan FAX-0141-2711100 Email-hod.wr@gsi.gov.in

GSI, NER, Shillong Additional Director General & HOD North Eastern Region Geological Survey of India GSI Office, Shylla Building, Nongrim Hills Shillong-793003 Meghalaya FAX-0364-2520033 Email-hod.ner@gsi.gov.in