With only a superficial area of 81,500 square miles of country, and a climate by no means tavorable for agricultural productions, what would Britain be without her valuable 9,000 miles of coal fields ...

The Earth itself is around 4.65 billion years old, so not much older than black diamonds. Carbonados are extremely rare and have only ever been discovered in Brazil and the Central African Republic.

The most valuable black opal features bright red stone against a very black base. In the '80s and '90s, gem-quality brown diamonds were worth about $1,500 per carat, but now many sell for up to $ ...

Big deals are mounting at outdoor gear retailers like REI, Backcountry, and even Amazon as Black Friday looms closer, but one ...

Only known to exist in Brazil and the Central African Republic, “carbonado” black diamonds date from around 2.6 to 3.8 billion years ago and are an extremely rare natural occurrence.

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 ...