GIA’s New York campus is a state-of-the-art facility in the International Gem Tower – right in the heart of the famed Diamond District. The campus is feet away from thousands of businesses devoted to ...

Through extensive hands-on practice using gemstones, you will explore grading the color, clarity and cut quality of a wide range of colored stones. Coursework includes the study of the GIA Colored ...

Practice the same time-tested procedures and identification skills used by the Institute’s renowned gemological experts. Tools used include a microscope, a refractometer with polarizing filter and a ...

この宝飾品のバロック真珠は、トリトンの体を形成しています。 © Victoria and Albert Museum（ヴィクトリア＆アルバート博物館 ...