On Earth, garnet is best known as the fiery red January birthstone—popular in jewelry since the Bronze Age and valued highly by ancient Egyptians. Our team has now discovered a new rock type ...

On Earth, garnet is best known as the fiery red January birthstone — popular in jewellery since the Bronze Age and valued highly by ancient Egyptians. Our team has now discovered a new rock type ...

Garnets have been a highly collectible gemstone since prehistoric times, and Arizona is renowned for hosting some of the best specimens. These gemstones are formed as a result of a combination of high ...

Chemical, optical, and physical data for a representative collection of 202 transparent gem-quality stones are summarized. Eight garnet species are defined—grossular, andradite, pyrope, ...

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