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 ...

在某些情况下，受过培训的宝石学家可以通过使用标准宝石检测设备，识别化学蒸气沉淀法 (CVD) 或高压高温 (HPHT) 制造和处理的钻石。但有些时候，宝石学家还需要使用先进的科学仪器对钻石进行测试，才能完成鉴定。GIA 拥有关于各类钻石宝石学特性的庞大数据库，我们利用该数据库来开发其他的 ...

Figure 1. A miner in northern Tanzania examines rhodolite rough from a local deposit. Photo by Robert Weldon/GIA. Selecting Gem Rough: A Guide for Artisanal Miners was researched, photographed, ...

镁铝榴石和铁铝榴石的颜色范围从紫色到橙红色。 锰铝榴石是各种橙色的宝石类别，而钙铁榴石则为黄色到绿色。 钙铝榴石具有广泛的色彩范围，从无色、黄色至红橙色和橙红色，再到强烈的、鲜艳的绿色。

The GIA Report Results API allows applications to integrate with GIA’s database in order to verify grading information and retrieve GIA report PDFs, images and other assets associated with a GIA ...

Gemological LibraryResources The library provides a wide variety of gemstone-and-jewelry-related resources for students, staff, researchers, alumni, members of the industry, and the general public.

Jewelry Design Certificate Get ready to turn your inspirations into designs with the Jewelry Design course. You’ll learn drafting, shading, design theory, how to illustrate shape and form using ...

Cultured pearls come in different sizes, shapes, and colors. Perhaps the best-loved gems of all time, pearls—both natural and modern cultured pearls—occur in a wide variety of colors. The most ...

If you were born in February, your birthstone is amethyst – the purple variety of quartz that has captivated mankind for millennia. Its lilac to deep purple hues can be cut into many shapes and sizes, ...

GIA is proud to provide the most comprehensive research in the industry with a world-renowned field gemology team and a dedication to acquiring colored stones directly from the source. Our ...

Crystal and Water Opal Crystal opal is transparent to semitransparent with a clear background. This type of opal can show excellent play-of-color. Water opal might or might not display play-of-color.

Graduate Jeweler Program The Graduate Jeweler diploma program is a hands-on experience that introduces students to the knowledge and skills required for a career in jewelry fabrication and repair. You ...