We have been informed, on good authority, however ... but we could not do without our coals. The Koh-i-Noor diamond is valued at $2,500,000—a sum which could purchase 590,000 tons of coal.

Meline: A pearl is one of the most complex gems to assess the value of. One factor is whether it's natural or cultured. Natural pearls are harder to find, making them worth more money. The vast ...

The 555.55 carat black diamond has belonged to its current owner for two decades but little is known about its history before that. A billion-year-old black diamond, believed to be the largest cut ...

Others maintain that carbon atoms (or, in a minority opinion, grains of meteoritic black graphite) within the hurtling meteorite itself transformed instantly into diamond during the extraordinary ...

The 555.55 carat black diamond has belonged to its current owner for two decades but little is known about its history before that. A billion-year-old black diamond, believed to be the world's ...