Figure 1. A single tourmaline fiber contains three distinct chemical zones, each recording the fluid composition at the time of growth. Between zones, fluids dissolved preexisting tourmaline to ...

The People's Republic of China has recently placed a high priority on identifying and developing its gemstone resources. Initial exploration by teams of geologists throughout China has identified many ...

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。 不同颜色的拓帕石其价值要素具有微妙差异。 帝王色、蓝色和黄色需根据相应的标准进行评估。 寻找珠宝商 使用邮政编码寻找您附近有 GIA 报告和有 GIA 训练有素的工作人员的珠宝商 。 验证您中 ...

如果处理过程没有影响坚固性的问题，那么红宝石会是一种非常坚固的宝石。 - Jan Goodman 公司友情提供 硬度和韧度 莫氏硬度用以衡量宝石和矿物的硬度。 这些数字基于一种矿物可被其他物品划伤的相对难易程度得出。 但莫氏硬度容易产生误导。 矿物之间的 ...

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, ...

This 5.30-carat emerald from Brazil has a slightly bluish green color. Courtesy John Parrish, courtesy African, Brazilian, Colombian Gems Incorporated. Emerald has many special qualities, but colored ...

The green turquoise cabochon, from an American mine, might become part of a designer’s unique jewelry piece. The even blue color of the cabochon on the right would be called “Persian blue” in the ...

The September birthstone is sapphire – a gem that’s been cherished for thousands of years. Although the term sapphire usually refers to the blue variety of corundum (ruby is the red variety), this ...

以莫氏硬度衡量宝石和矿物的硬度。 这些数值基于一种矿物可被其他物品划伤的相对难易程度得出。 但莫氏硬度易产生误导。 矿物之间的等级差距并不相等。 举例来说，钻石仅比刚玉高一个等级，但其硬度却比刚玉坚硬许多倍。 碧玺在莫氏硬度表上居 7 至 7.5。

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 ...

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, ...

GIA does not unmount and remount stones. However, Colored Diamond Identification and Origin Report service and most identification services for colored stones and pearls can be performed on mounted ...