GIA laboratory-grown diamond reports includes a full quality assessment for laboratory-grown diamonds on the same scales as the GIA’s grading reports for natural diamonds. The specifications do not ...

During the past 25 years, the corundum market has been transformed from one of medium to high-priced gems to one that encompasses nearly all price ranges. This transformation was caused by the ...

Though not characterized this way, there is almost a cradle-to-grave approach at work here. You can learn sources of information about jewelry, old and new, how to verify the nature and quality of the ...

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, ...

Renewed interest in large-scale commercial mining of Montana sapphires motivated a detailed study of the heat treatment of sapphire from the Rock Creek deposit. During the course of this systematic ...

GIA does not offer appraisal courses. However, GIA programs provide the skills needed to identify and grade gems, understand jewelry manufacturing techniques and recognize quality in jewelry pieces.

This 146.10-carat peridot is in the collection of the Natural History Museum in London Peridot has always been associated with light. In fact, the Egyptians called it the “gem of the sun.” Some ...

GIA 祖母绿原产地报告样本，包含填充物鉴定。 从 12 月 15 日起，您可选择是否进行填充物鉴定 加州 卡尔斯巴德市 — 2024 年 12 月 11 日 — 鉴于业界更关注祖母绿中的填充物性质，GIA美国宝石 ...

A classic two-circle reflecting goniometer was used to measure inter-facet angles on five faceted diamonds that included round brilliants and fancy shapes. The instrument provided significantly better ...

Amethyst may develop into the more common citrine and rarer green quartz naturally under certain geologic conditions. On the California-Nevada border, just north of Reno, amethyst, citrine, and green ...

Each year basalt-topped Peridot Mesa, on the San Carlos Apache Reservation, is a major source for thousands of carats of gem-quality peridot in sizes suitable for use in modern jewelry. Marketed ...