The lack of a grading system for the popular stone has prompted a father-son team to spend the last five years working on one. Turquoise stones from the blue and green master sets at the Turquoise ...

Every gemstone out there comes with its own list of alleged qualities. Emeralds signify fertility and rebirth. Sapphires are stones of wisdom. Amethysts protect against negativity. And aquamarines are ...

Popularized by Turkish traders, embraced by Native Americans and now mined extensively by the Chinese, turquoise varies so widely in color and form that many American Indians say no two stones are ...

About a millennium ago, the ancestral Pueblo Indians in the Chaco Canyon in northwestern New Mexico obtained their precious turquoise using a large trade network spanning several states, new research ...