宝石業界以外の人で、鉱山から宝石店のカウンターに至るまでの宝石の流通の本質について知っている人はほとんどいません。 その宝石が伝統的な宝石店、インターネットのショッピングサイト、またはテレビ放送、どの方法で消費者に提供されているのに ...

Aquamarine, Maxixe-type (irradiated) beryl, and two types of hydrothermally grown synthetic blue beryl currently available in the marketplace were investigated by classical gemological methods, ...

This large Australian light opal cabochon weighs 117.85 carats. Small play-of-color flashes of orange and green predominate in a pinfire pattern, with spots of a more muted blue over a grayish ...

蓝色拓帕石成为艺术雕刻品的理想宝石材料。 - Lydia Dyer, John Dyer & Co. 友情提供 颜色 红色是拓帕石中最抢手的颜色之一，在发现的只有 1％ 适合刻面的材料中只占不到一半。 业内称为帝王拓帕石的宝石拥有非常珍贵的颜色，也非常罕见。 很多经销商坚持认为 ...

The book examines the skeletons discovered by chance in Roman catacombs (underground tombs) in the mid-16th century. The Vatican declared the tens of thousands of skeletons found in these vast ...

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.

A 43-carat alexandrite in the collection of the British Museum. Abundant alexandrite deposits were first discovered in 1830 in Russia’s Ural Mountains. Those first alexandrites were of very fine ...

People from all over the world send their diamonds to the GIA laboratory for grading and analysis. Our clients put their business in our hands and their trust in our expertise – and we are extremely ...

In 2009, GIA bestowed its highest honor, the Richard T. Liddicoat Award for Distinguished Achievement, on longtime chief research gemologist John I. Koivula. The award was based on his contributions ...

Citrine is one of the most popular yellow gems on the market. This designer cut shows off the warm glow of citrine’s sunny color. – Lydia Dyer, gem courtesy John Dyer & Co. Citrine—the transparent, ...

タンザナイトは、世界で最も人気のカラーストーンのひとつだ。- 提供：Tanzanite Foundation™（ タンザナイト財団™） タンザナイトには、様々なサイズやカッティング・スタイルがあり、多方面に利用されます。1960 年代後半に発見されたばかりですが、すぐ ...

合成宝石材料是在实验室中制成的一种材料，但却具有与其相对应的天然矿物相同的化学、光学和物理特性，虽然在某些情况下，如合成土耳其石和合成蛋白石，可能会有其他化合物的存在。 自 19 世纪后期以来，就已经开始生产合成宝石晶体，其产品往往是 ...