The diamond likely originated in the Golconda mines in India ... the British Crown Jewels in the Tower of London. This famous egg-sized gemstone was probably mined in modern-day Tajikistan ...

The blue-green mineral widely regarded as a gemstone has significant deposits ... from Albuquerque being in the Cerillos area. Different mines produce their own particular types of turquoise ...

Spray hoped to capitalize on the metal’s rebounding value, but the mine would instead become famous for producing ... According to Colorado School of Mines, rhodochrosite’s name is of Greek ...