Since Robert Crowningshield's discovery in the late 1950s that diamonds that have been artificially colored by irradiation and subsequent annealing could be identified by their characteristic ...

A look at the history of analytical instruments used for gem testing. UV-Vis-NIR spectroscopy measures how gemstones absorb and interact with light across the ultraviolet, visible, and near-infrared ...

Cultured pearls come in different sizes, shapes, and colors. Perhaps the best-loved gems of all time, pearls—both natural and modern cultured pearls—occur in a wide variety of colors. The most ...

Although the Art Deco period extends roughly from 1910 to well into the 1930s, it was primarily a product of the "Roaring '20s." This was a wonderfully decadent era. It was an age of Prohibition and ...

GJS will comprise the top of the line manufacturers/wholesalers of Gems & Jewellery as well as dealers from all over the industry. The show will assemble the best ...

Jewellery Machinery & Allied India International Expo (JMAIIE) is the first ever exclusive international exhibition on jewellery machinery & allied products. Visit GIA India for more information on ...

10月生まれの方は、誕生日を祝福するのに2つの素晴らしい誕生石、オパールとトルマリンをお楽しみいただけます。10月の誕生石は、両方とも無限の色の組み合わせを持ち、美しい色を ...

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 ...

GIA instructors are passionate educators who bring years of industry experience to the classroom. All are leaders in their fields, and all are dedicated to helping you gain knowledge, acquire skills ...

单词琥珀色表示棕黄色，但琥珀（宝石）可为黄色、金色、白色、橙色至红褐色，甚至偏蓝或偏绿。 波罗的海琥珀一般比多明尼加的琥珀更加昂贵。 含有昆虫或植物内含物的琥珀价格比清澈无 ...

青金石是多种矿物的聚晶。 天青石晶粒赋予青金石标志性的蓝色，而黄铁矿的金色斑点增添诱人的对比。 青金石是一种岩石，这意味着它是多种矿物的聚晶。 这种古老的宝石包含三种矿物 ...

This ancient necklace dates to 2000BCE. An inscription on the center stone is a South Arabian script from the 8th century BCE. - From "Gems and Gemstones: Timeless Natural Beauty of the Mineral World" ...