Opening marks GIA’s ninth global stone grading lab.

The Gemological Institute of America (GIA) has opened a diamond grading laboratory in Tokyo, Japan, marking the GIA’s ninth global laboratory.

The new lab opened for business, accepting diamonds for grading directly from clients, yesterday, a year after the GIA announced its intentions to open a lab in Japan.


The GIA laboratory in Tokyo will initially offer the GIA’s Diamond Dossier and Diamond Grading Report services for D to Z diamonds up to 2.99cts. The Tokyo lab will also accept coloured stones and pearls for any other GIA services which – at present – will be sent to another GIA global laboratory lab and returned to Tokyo for pick-up. GIA says that it plans to expand the number of services offered by its Tokyo facility in the coming months.

Tom Moses, GIA’s senior vice president for laboratory and research, said: “Bringing GIA’s diamond grading standards and research-backed lab services to such an important market will serve the public interest by supporting the Japanese gem and jewellery industry.

“Our global network of laboratories enables GIA to remain at the forefront of gemmological developments and provide the best possible service to our laboratory clients.”

The GIA has offered educational programs in Japan since the 1970s, and there are said to be nearly 4,000 holders of the institute’s Graduate Gemologist diploma in Japan.

Mari Okada, manager of the GIA laboratory in Tokyo, said: “Providing grading services to the gem and jewellery sector where they operate central to GIA’s practice. We are excited to open a laboratory in Tokyo to complement GIA’s long-standing educational presence in Japan.”