Garnet is January's birthstone. Its name derives from the medieval Latin " granatus ," meaning "pomegranate," according to ...

Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

Garnet is January's birthstone. Its name derives from the medieval Latin " granatus ," meaning "pomegranate," according to the Geological Institute of America. The name is also tied to the Middle ...

Its name derives from the medieval ... blue and yellow. A garnet's color depends on its chemical composition, according tothe International Gem Society. For instance, almandine garnets range ...