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 ...

Blue diffusion-treated sapphires are becoming more prevalent than ever before. The diffusion technique, which involves the addition of color-causing chemicals during heat treatment, results in a thin ...

Describes the geology, mineralogy, and formation of granitic-composition pegmatites and provides a summary of their worldwide occurrences. Structures Behind the Spectacle: A Review of Optical Effects ...

誕生石は、楽しくて人気のあるカラフルな方法で宝石の世界へと導いてくれます。性別、年齢、国籍、宗教を問わず、世界中の人々を魅了します。誕生石は、それぞれの宝石特有の秘密、特性、伝承を持っています。誕生石には、数多くの異なるパワーや ...

Below is the list of recognized holidays when GIA locations will be closed.View the holiday schedule for all GIA locations worldwide.

GIAジュエリーサービスレポートは、詳細にわたる公平な分析をわかりやすいフォーマットで提供します。 GIAジュエリーレポートは、ジュエリーのあらゆる側面について深い洞察を求めるお客様のために作成されたものです。石の数、形、推定カラット重量 ...

GIA offers many opportunities for students to receive a scholarship. Scholarship offerings are made available to assist eligible students in reducing their financial burden and focusing on completing ...

Zambia is considered the world’s second most important source of emeralds by value (after Colombia). The deposits are located near the Kafubu River in the Ndola Rural Restricted Area. Emeralds have ...

Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.

以下是 GIA 将休业的法定假期列表。 2025 年 5 月 5 日（星期一） 玛哈•哇集拉隆功国王陛下加冕（补假） 2025 年 5 月 12 日（星期一） 卫塞节（补假） 2025 年 6 月 3 日（星期二） 王后陛下诞辰 2025 年 7 月 10 日（星期四） 守夏节 2025 年 7 月 28 日（星期一） 玛哈• ...

Figure 1. Sapphires from a variety of sources. Faceted stones (left to right): 6.36 ct pink/orange (padparadscha), 1.63 ct pink, 4.76 ct violet, 5.43 ct violet purple, 3.03 ct blue, 2.12 ct blue, 8.06 ...

Everywhere on earth, people honor and appreciate the beauty and mystery of gems. And so it follows that everywhere you go, you also find the gem and jewelry industry. Just like the gems that are at ...