Ruby is the July birthstone – and it’s one of the most coveted of gems. The name is derived from the Latin word ruber, meaning “red” – the color of love and passion. Few things catch the eye like the ...

Laser sawing of diamonds is beginning to revolutionize the diamond-cutting industry. Not only does the laser saw offer savings in time and money, but it also enables the cutting of material virtually ...

Figure 1. Faceted manufactured glass beads measuring approximately 8 mm in diameter. Photo by Robison McMurtry. A collection of lovely faceted blue beads was presented to author EAS during an annual ...

Pietersite has been described as a brecciated variety of tiger’s-eye. This study examined pietersite specimens from Namibia and China (the main sources) using powder X-ray diffraction, optical ...

Over the last two decades, knowledge of the formation of gem deposits has improved significantly. This article reviews the state of our knowledge of the geology and genesis of gem corundum and emerald ...

Bluish green tourmaline crystals and white calcite on a Burmese ruby. Photo by Charuwan Khowpong; field of view 2.48 mm. During a GIA field expedition to Mogok, Myanmar, a tiny but interesting sample ...

Zircon comes in a wide variety of colors. Colorless zircon is well known for its brilliance and flashes of multicolored light, called fire. These two zircon properties are close enough to the ...

蓝宝石有多种颜色。 这颗罕见的 1,126.00 克拉 刚玉晶体呈粉橙色，被称为帕帕拉夏（padparadscha），以莲花命名。 - © GIA & Tino ...

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。

The 330-ct Star of Asia is in the collection of the National Museum of Natural History – Chip Clark, courtesy Smithsonian Institution Traditionally, sapphire symbolizes nobility, truth, sincerity, and ...

Rachelle Turnier（雷切尔·特尼尔）使用拉曼光谱学和光致发光映射来更好地了解玄武岩相关蓝宝石的形成，这是她读博期间的 研究重点。摄影：Kevin Schumacher（凯文·舒马赫）/GIA。 Rachelle Turnier ...

This 15th-16th century icon of Mexican (Aztec) art, was probably worn on the chest on ceremonial occasions. ©The Trustees of the British Museum Turquoise is one of the world’s most ancient gems.