From brilliant blues to fiery reds, discover how nature crafts diamonds in every color, and why some shades are rarer than ...

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.

While popular destinations like New England and the Rockies often steal the spotlight, there are hidden gems across America waiting to be explored for their lesser-known fall colors. From the ...

(PRESS RELEASE) The World Jewellery Confederation (CIBJO), the American Gem Trade Association (AGTA) and the International ...