Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...

Because diamonds formed deep within the earth, under extreme heat and pressure, they often contain unique birthmarks, either internal (inclusions) or external (blemishes). Diamond clarity refers to ...

New York is one of the world’s media, financial, entertainment, and fashion capitals. It’s home to the iconic landmarks like Wall Street and the Statue of Liberty, and to edgy artist enclaves like the ...

GIA instructors are passionate educators who bring years of industry experience to the classroom. All are leaders in their fields, and all are dedicated to helping you gain knowledge, acquire skills ...

A synthetic gem material is one that is made in a laboratory, but which shares virtually all chemical, optical, and physical characteristics of its natural mineral counterpart, though in some cases, ...

GIA studied more than 400 important gemstones from the Gübelin Collection and is committed to sharing this repository of gemological information. This work is a valuable resource for all students, ...

George Frederick Kunz（ジョージ·フレデリック·クンツ） クンツァイトは、カラーストーンの中では比較的新しい宝石でです。 伝えられているところによれば、まだ 正体不明のピンクの水晶の標本は、カリフォルニア州のサンディエゴ郡で発見され ...

位于 GIA 全球总部的 The Robert Mouawad Campus（罗伯特·懋琬校区）是首屈一指的宝石研究和珠宝设计学校，将现代教室以及国际公认的博物馆充分整合于加利福尼亚州美丽的卡尔斯巴德。 GIA 纽约校区置身于国际宝石大厦 (International Gem Tower) 之中，地处著名的钻石区 ...

Payette F. “A simple approach to separate natural from synthetic ametrine,” The Australian Gemmologist, Vol. 25, No. 4, 2013, pp. 132–141. Photo courtesy of Francine Payette. Ametrine is a bicolored ...

宝石品質のダイヤモンドは、元の結晶形状からどのように形成加工されようとも、他の宝石には見られない輝き、きらめき、ファイアー、純度の複合された性質を持ち合わせている。 - Jeff Scovil, 提供 Barker & Co. ダイヤモンドはその特徴的な化学組成や結晶 ...

Since both were washed up from the sea, the words for amber and ambergris, a waxy substance secreted by sperm whales, are similar. Ambergris was the base of many perfumes in the ancient world.

Figure 1. Two different types of Japanese hyalite rough specimens under daylight (left) and short-wave UV light (right). The photo on the right demonstrates the strong yellow-green fluorescence of ...