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In mineralogy, diamond (from the ancient Greek adámas) is the allotrope
of carbon, where the carbon atoms are arranged in a variation of the face centered
cubic crystal structure called diamond lattice. After graphite, diamond is the
second most stable form of carbon. Its hardness and high dispersion of light make
it useful for industrial applications and jewelry. It is the hardest known mineral.
It is possible to treat regular diamonds under a combination of high pressure
and high temperature to produce diamonds that are harder than the diamonds used
in hardness gauges. Diamonds are specifically renowned as a material with superlative
physical qualities; they make excellent abrasives because few substances can scratch
them. As a result, they hold a polish extremely well and retain their luster.
Approximately 130 million carats (26,000 kg (57,000 lb)) are mined annually, with
a total value of nearly USD $9 billion, and about 100,000 kg (220,000 lb) are
synthesized annually. | ||
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The name diamond is derived from the ancient Greek ?????? (adámas), "unbreakable, untamed", from ?- (a-), "un-" + ????? (damáo-), "I overpower, I tame". However, diamonds are thought to have been first recognized and mined in India, where significant alluvial deposits of the stone could then be found many centuries ago along the rivers Penner, Krishna and Godavari. Diamonds have been known in India for at least 3000 years but most likely 6000 years.
Diamonds have been treasured as gemstones since their use as religious icons in ancient India. Their usage in engraving tools also dates to early human history. Popularity of diamonds has risen since the 19th century because of increased supply, improved cutting and polishing techniques, growth in the world economy, and innovative and successful advertising campaigns.
In 1813, Humphry Davy used a lens to concentrate the rays of the sun on a diamond in an atmosphere of oxygen, and showed that the only product of the combustion was carbon dioxide, proving that diamond is composed of carbon. Later, he showed that in an atmosphere devoid of oxygen, diamond is converted to graphite.
The most familiar usage of diamonds today is as gemstones used for adornment, a usage which dates back into antiquity. The dispersion of white light into spectral colors, is the primary gemological characteristic of gem diamonds. In the twentieth century, experts in the field of gemology have developed methods of grading diamonds and other gemstones based on the characteristics most important to their value as a gem. Four characteristics, known informally as the four Cs, are now commonly used as the basic descriptors of diamonds: these are carat, cut, color, and clarity.
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