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 ...

CARLSBAD, California – December 11, 2024 – Recognizing the industry’s interest in more information about the nature of fillers in emeralds, GIA will offer filler identification with its emerald ...

Students explore more than 60 species of common and collector gemstones found in the marketplace. Subjects covered include the GIA Colored Stone Grading System, gemstone formation, composition, ...

As a consumer, you will regularly encounter in the marketplace gems that have been treated to change their appearance. A topic that often comes up is whether a particular gemstone is or isn’t treated.

Figure 1. Pleochroism in a 15 ct tanzanite, as seen with the unaided eye through the crown and the pavilion sides and ends. Photo by Wimon Manorotkul. In describing colored gemstones, the major ...

"The Path of Enlightenment" necklace contains 180 magnificent opals from Lightning Ridge, Australia, a famous opal producing area. - Courtesy Cody Opal Opal is the product of seasonal rains that ...

This 10.12 ct Fancy Vivid yellow pear shape illustrates the effect a fancy shape can have on intensifying the color in a yellow diamond. - Courtesy the Scarselli Family Color In diamonds, rarity ...

ファセットカットされた天然ダイヤモンド（左）と人工ダイヤモンド（右）。写真提供：GIA ダイヤモンドのように見えて輝いていれば、それはダイヤモンドでしょうか。 近年、宝石店の ...

GIA iD100 ® は、色の範囲が無色からほぼ無色、サイズが直径0.9ミリメートル以上のダイヤモンドにおいて、石留めされたものおよび裸石、原石およびカット済みの天然ダイヤモンドを ...

GIA’s diverse course offerings will help prepare you with the knowledge and skills needed by industry employers today.

GIA 重視您的個人資料的隱私。本學生隱私聲明（“聲明”）描述了 GIA 處理（包括收集、使用和處理）您作 為教育服務申請人、學生或校友與 GIA 的關係方面的政策和做法。 如果您以非教育服務 ...

GIA 远程教学包含网络学习和实习班。 网络学习是指在线进行课程学习 — 课程材料在线提供，作业和期末考试在线进行。 在实习班，您可以和讲师一起分级和鉴定宝石，获得必要的实践经验。