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

Unlock your potential with GIA’s gem education programs, offering expert-led courses in diamonds, gemstones, and jewelry to advance your career and knowledge.

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 ...

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.

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 ...

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 ...

查看全球所有 GIA 机构的节假日安排。

The June Hong Kong Jewellery & Gem Fair opens on June 22, a mid-year trading event for the gem and jewelry trade. Visit GIA at booth 3M100. Learn about sales tools, aids and apps available through the ...

GIAは、6月17日にニューヨークで開催されるクリスティーズの「Magnificent Jewels（素晴らしい宝石）」オークションに先立ち、30以上の希少で歴史的に重要な宝石を鑑定しました。

加利福尼亚州卡尔斯巴德– 2025 年 6 月 12 日 – 6 月 17 日纽约举行的佳士得“Magnificent Jewels”拍卖会之前，GIA美国宝石研究院已对超过 30 件稀有且具有历史意义的珠宝进行了鉴定。其中最引人注目的是"Marie-Thérèse Pink粉钻 ...

CARLSBAD, Calif. – June 20, 2025 – The Board of Governors of the Gemological Institute of America, Inc. (GIA) has named Pritesh Patel, currently GIA’s Chief Operating Officer, as the Institute’s ...