欢迎来 GIA 香港校区学习，畅游在宝石和珠宝的世界，获得珍珠文凭 (Graduate Pearls)。这门具有变革性的课程开启了一扇通往机遇世界的大门。

Spinel is a good candidate for the title of “History’s Most Underappreciated Gem.” Some ancient mines that supplied gems for royal courts from Rome to China produced spinel, but it was usually ...

Birthstones are a fun, popular and colorful introduction to the world of gemstones. They appeal to audiences around the world regardless of gender, age, nationality or religion. Birthstones carry ...

Get expert, comprehensive analysis of your jewelry items. These services include assessments of natural D-to-Z diamonds, offering details such as estimated total carat weight, color and clarity ranges ...

colored stone research The microscope is one of the most important tools for a careful gemologist. Unbeknownst to the casual observer, there exists a fascinating and visually stunning microscopic ...

Explore diamond history, research, quality factors, and more in the GIA Gem Encyclopedia.

Search GIA's library catalog of 65,000 books, 230,000 images, 2200 videos, 1200 periodicals, and the renowned Cartier Rare Book Repository and Archive.

Major rock units of the Neyshabur mine are divided into three groups: volcanic, subvolcanic intrusions, and hydrothermal breccia (Ghiasvand et al., 2017). Although the volcanic rocks of trachyte and ...

Dr. Malczewski is a nuclear physicist and assistant professor at the Institute of Earth Sciences of the University of Silesia (Poland), specializing in the field of natural and anthropogenic ...

Sally Eaton-Magaña, Christopher M. Breeding, and James E. Shigley ...

This 32” x 20” wall chart presents GIA’s system for classifying pearl quality according to the seven factors of size, shape, color, luster, surface, matching, and nacre.

Dr. Gao is a research group leader of the National Gems & Jewellery Technology Administrative Center (NGTC) and director of the application R&D department at the Shenzhen Research Institute, NGTC. Ms.