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専門分野で次の段階に進もうとする方も、新しいキャリアを目指す方も、GIA のコースやディプロマプログラムを受講して成功への準備をすることができます。 GIA は、独自の画期的な研究から開発され、業界をリードする ...

Copper-bearing gem tourmaline, known as Paraíba tourmaline after the location of its original discovery, is prized for its vivid blue to green color. This article explains GIA’s use of quantitative ...

GIA ensures accurate gemological measurements across its global laboratories through rigorous metrology practices, including systematic instrument calibration, validation from traceable standards, and ...

Examination of samples of faceted "Ocean green" topaz reveals that this material has been irradiated in a nuclear reactor. An earlier reactor-irradiation experiment suggests that temperature ...

Learn more about the GIA Diamond Origin Report service which includes a country of origin opinion for eligible diamonds.

Characterizes an anorthoclase variety of alkali feldspar found in southeast Vietnam and evaluates its potential for commercial use.

Results from spectroscopic analyses of GE POL high-pressure high-temperature (HPHT) annealed nominally type IIa diamonds are presented, and these spectral characteristics are compared with those of ...

黄水晶是市场上最受欢迎的黄色宝石之一。 设计师切工令黄水晶绽放出明快和暖的光芒。 – Lydia Dyer，宝石由 John Dyer & Co. 友情提供 黄水晶是石英的的类别，呈透明的淡黄色到褐橙色，天然的不多见。 在现代宝石学建立前，它的黄褐色令其与拓帕石混淆。 黄水晶富有吸引力的颜色、坚固性和经济性 ...

GIAの教育に関するストーリー 宝石・宝飾業界における知識と信頼性が欠けていることを懸念していた宝石商によって設立されたGIAは、一般市民の方々を保護し知識を普及することに注力する非営利組織です。1931年以来、GIAは、ダイヤモンドの品質を示す4CおよびGIA真珠の7つの評価要因™を開発 ...

Gems & Gemology, the professional quarterly of GIA, debuted in 1934. Appearing in the 306 th issue, this article looks back at the first 75 years. By reviewing the journal’s milestones, it also traces ...