Only during the last few years have the gem riches of Pakistan become known to the rest of the world. This article reports on three gem materials currently being mined: emerald, corundum (most ...

Diamond is available in a range of sizes and qualities to fit every consumer's tastes. One of the first things most people learn about diamonds is that not all diamonds are created equal. In fact, ...

There is only one known commercial occurrence of gem-quality red beryl in the world: the Ruby Violet (or Red Beryl) mine in the Wah Wah Mountains of Beaver County, Utah. The beryl is found mostly ...

This note deals with some gemological applications for a tool well known to microscopists: the first-order red compensator. In gemological microscopy, the compensator can be useful in locating ...

这款 3.74 克拉 公主方形切工中等色调蓝色海蓝宝石由22 颗钻石环绕其周围。 这枚戒指是 Zoltan David（大卫·佐尔坦）的原创设计，已获得版权保护。 — Robert Weldon（罗伯特·韦尔登），由 Nancy's ...