Diamonds are chemically composed of elemental carbon and are the hardest known natural substances. Physically, industrial-grade diamonds are black in color, due to impurities, and gem diamonds come in a variety of colors, including colorless, red, yellow, orange, green, brown and blue. Diamonds have a high luster and high dispersion.Know More
Industrial diamonds are used in grinding, cutting, polishing and drilling procedures. They are also frequently crushed to produce abrasive powders. Since demand for industrial diamonds exceeds the supply obtained from mining, synthetic diamonds are produced to meet the excess demand. Diamonds are the world's most popular gemstones. Of the $19 billion spent on gemstones in the United States in 2010, $18 billion was spent on diamonds, with less than one billion dollars being spent on colored stones.
The quality of a diamond gemstone is dependent on the four C's: color, cut, clarity and carat. The most highly valued diamonds are those that are completely colorless. Ideally, cut stones have faceted faces that are equal in size and identical in shape. The ideal clarity for a diamond is one which is free from internal flaws and inclusions, which are foreign material particles in the stone. Diamonds are sold by the carat, and small diamonds cost less per carat than their larger counterparts of equal quality.Learn more about Precious Metals & Gems
Sand is primarily composed of finely granulated silica and, depending on its location, can include various rock, coral, shell or lava fragments. It is lightweight and easily transported by wind and water. Its composition directly affects its color, resulting in black, white, pink and green coloring.Full Answer >
Fats, also called lipids, are composed of the elements carbon, hydrogen and oxygen. Three fatty acid chains attach to one glycerol unit to form a triglyceride, the most common form of dietary fat.Full Answer >
Vanadium is readily alloyed with other metals, and it resists corrosion from oxygen, salt water, alkali compounds and many acids because it forms an impermeable coating of vanadium oxide in air. While it resists more thorough oxidation at low temperatures, it readily forms the important compound vanadium oxide above 660 degrees Celsius. This compound has two vanadium atoms bound to five oxygen atoms and is relatively soft and ductile.Full Answer >
Lithium is an element that is part of the alkali metal group. It has an atomic number of 3 and an atomic mass of 6.94. It is represented by the symbol Li.Full Answer >