Figure 1. Left: 18K yellow gold “Flames” ring with 25.19 ct Mexican fire opal. Right: This 18K yellow gold “Spice” ring ...

The published literature offers only a few records of direct measurement of the natural radioactivity in nephrite. The present study used high-purity germanium (HPGe) low-background gamma-ray ...

Attain your dream of a GIA education with the help of a scholarship, grant, or loan. GIA also accepts outside sources to fund your education, including vocational rehabilitation and Veterans’ benefits ...

Industry-leading research, education and innovation have kept GIA on the cutting-edge of gemology since 1931, and we invite you to join us during JCK to experience our latest discoveries! Visit us in ...

This course covers how to describe diamond jewelry accurately for effective and ethical sales conversations with customers. Key topics examined include the internationally accepted GIA clarity grading ...

Two Antique Mughal Spectacles with Gemstone Lenses Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory. Read More ...

完整的 4C 评估，并附有净度特征标绘图。实验室培育钻石的腰围上会用镭射刻字技术刻上“Laboratory-Grown”（实验室培育）字样和 GIA 报告编号。适用于颜色为 D 到 Z 级、重 0.15 克拉或以上的未镶嵌实验室培育钻石。仅提供数字报告。 完整的 4C 评估。实验室培育 ...

CARLSBAD, Calif. – May 19, 2025 – GIA (Gemological Institute of America) is introducing an expanded approach to evaluating nacre on all pearl classification reports, providing an important update to ...

In the last few years, the influx of synthetic diamonds into the market has sparked tremendous interest in the laboratory growth of this beautiful and fascinating gemstone. The chart provided here ...

In late January 2015, nearly 100 scientists gathered in the northern Italian town of Brixen to attend the Second International Diamond School (IDS). The program, titled “The Nature of Diamonds and ...

Figure 1. Bicolored elbaite tourmalines (5–8 ct) from the Himalaya mine in Southern California are set with yellow diamonds, tsavorites, and red-purple elbaites. These custom-made earrings, ring, and ...

CARLSBAD, Calif. – May 12, 2025 – Young students anywhere in the world can now experience the wonder of gems and minerals with GemKit™ by GemKids ®, an online treasure trove of information and ...