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 ...

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 ...

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 ...

Those born in January are lucky to have the beautiful and diverse garnet as their birthstone. Garnets are commonly red but also come in an extraordinary range of beautiful colors, including orange, ...

This 7.19-carat alexandrite was cut to feature its beautiful color change. When the light source changes from daylight to incandescent light, the gem’s color changes from bluish green to reddish ...

这款获奖的 30.28 克拉 超三角形切工展示了黄水晶备受赞誉的饱和的橙红色。 – John Dyer，宝石由 John Dyer & Co. 友情提供 颜色 黄水晶具有吸引力的颜色、坚固性和经济性（与其他大部分石英相同 ...

来自波兰格丹斯克市琥珀博物馆的 Gierlowska 蜥蜴。 琥珀可能因含有昆虫和其他类型的内含物而闻名。 数百万年前，一些蚂蚁、蜜蜂、白蚁和其他昆虫被裹进了无数植物中渗透出来的琥珀树脂。

这颗年代久远的华丽垫型切工橄榄石重 130.60 克拉有宝石最优良的属性：中等深度的色调、高饱和度的黄绿色彩以及高净度。 橄榄石可用于多种类型的珠宝。 即使是一般商业质量的橄榄石，也 ...

Most colored gemstones form near the earth’s surface in a wide range of different environments; for example, they can crystallize from igneous magmas or hydrothermal solutions, or via the ...