코리아 젬 소사이어티
KOREA GEM SOCIETY Since 2015
단체 소개
Total 9 / 1 page
GIA(Gemological Institute of America)
ICA ( International Colord Gemstone Association)
Rapaport
Natural Diamond Council
World Gold Council
AGTA(American Gem Trade Association, Inc.)
American Gem Society
Japan Gem Society
Korea Gem Society
