"Alaska black diamonds" is the trade name of a mineralized form of iron oxide known as hematite. Hematite occurs around the world, and the milled gemstones created from it hold a lustrous black finish. Hematite has been called bloodstone because it can be ground into a dark red powder that the ancients believed to be coagulated blood, hence its use as an amulet for pre-scientific medical applications.Know More
Hematite powder's association with dried blood is not totally unwarranted. The red powder it degrades into is, in fact, rich with oxidized iron. Iron oxide is what gives red blood cells their characteristic color, and the compound, known commonly as rust, is also prevalent in the surface soils of Mars.
Hematite is common on Earth, and it is the main form in which iron is mined from the crust. The mineral was laid down globally in huge deposits known as banded iron formations mostly between 1.8 and 2.4 billion years ago as oxygen proliferated in the atmosphere. Free iron is unstable in the presence of oxygen, and the loose iron in Earth's oceans reacted to its presence by oxidizing and precipitating out to form the hematite deposits from which Alaskan black diamonds would later be quarried.Learn more about Precious Metals & Gems
Natural diamonds are formed deep within the earth, using heat and pressure found around 87 to 118 miles beneath the surface. Carbon compressed tightly together forms a crystal lattice, the purity of which determines colors in the diamond.Full Answer >
Natural diamonds typically come from inside the Earth’s mantle. They form when carbon deposits are acted upon by a combination of high temperatures and pressure. Formation of a diamond from carbon requires one to 3.3 billion years, and they rise in magma to near the Earth’s surface through volcanic action. Once the magma has cooled into igneous rock, the diamonds can be mined.Full Answer >
Pure purple diamonds are precious stones that are exceedingly uncommon in nature and often occur as synthetic diamonds. Pure purple ranks as the second rarest hue in diamonds.Full Answer >
Blood diamonds, sometimes called conflict diamonds, are stones mined in areas of the world undergoing civil war or strife and sold to support warlords, insurgents or invading armies. Since diamonds are extremely valuable and portable, trading these stones is an easy way for forces to generate quick money.Full Answer >