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 The Diamond Cartel

The discoveries of 1870-71 in South Africa led to a great number of prospectors staking out claims and securing the diamonds by open-pit or quarry mining. The damage caused by floods and mudslides, unavoidable when there were so many different claims, was an important factor in the series of amalgamations carried on by Cecil Rhodes and Barnett Barnato. Rhodes brought about the merging of their interests in the De Beers Consolidated Mines, Ltd., which established (1889) an effective monopoly over the diamond industry. Loss of diamonds by theft was reduced through the passage of the so-called I.D.B. (Illicit Diamond Buying) Act, which limited the trade to licensed buyers and imposed penalties for the possession of uncut stones without a license. Thefts were further curtailed by the institution of compounds in which the workers live while employed by the company and which they leave only after being thoroughly searched.

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Mining 

Block caving is the most commonly used method in excavating diamonds from kimberlite deposits. This method offers the highest yield and thus is the most cost effective. First, a large vertical hole is excavated, typically 1,750 feet (533 m) in diameter. Levels are placed approximately every 40 feet (12 m). Along these levels are horizontal tunnels known as scraper drifts. In the drifts, there are small inclined coneshaped openings at intervals of every 11 feet (3 m) or so. These openings are roughly four feet by four feet. When a horizontal slice is cut above the cones—usually about six feet (1.8 m) in height—the kimberlite begins to break off and fall into the cone and into the scraper drift. The material is then pushed onto trucks. The trucks travel underground through the mining area and take the collected kimberlite to a crushing device.

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The Ancient World

The wearing of jewelry has very ancient roots. The oldest examples discovered to date are about 75,000 old. Found in a cave in S Africa in 2004, they consist of pea-sized pierced shell beads that were probably strung into a necklace or bracelet. Other African beads have been found dating back some 45,000 years. In the ancient world, the art of jewelry making reached an elaborate development in East Asia with its wealth of precious stones and pearls. Egyptian relics also show a rare craftsmanship. The jewelry is largely emblematic, very colorful, and displays lotus flower and scarab motifs. Beads were used extensively, as in broad collars, and were often used for bartering. Armlets and anklets were also worn.

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Occurrenc

In alluvial deposits the harder and heavier diamonds survive when parent rock weathers and is worn away. They are mined from the original rocks only in Siberia, South Africa, Australia, and in Arkansas. They usually occur in a basic plutonic rock in cylindrical, more or less vertical, volcanic plugs known as "pipes." In Canada many suitably located pipes (and glacial deposit finds) indicate that there is a possibility of economic diamond-bearing formations in the north. Alluvial localities, perhaps reweathered with their prime source long gone, are numerous. Sporadic diamonds are found in gold placers in the eastern U.S. and in California. In recent decades Siberia has become an important source. Brazil, New Guinea, India, Namibia, and other African states have many localities, though none has proved notably large or abundant.

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The Middle Ages to the Seventeenth Century

Jewelry of the Middle Ages was massive; large brooches and girdles predominated. Amber was worn as a protection against evil spirits. After 1300 glass beads were used. The Renaissance brought a transformation in the art of the jeweler; noted artists and architects often designed or even rendered pieces of jewelry. Jewelry was splendid with enamel and precious stones; heavy gold link chains, jeweled collars, and the necklace with pendant were worn by both men and women. Jewelry, worn to excess, became overcrowded with stones, to the neglect of the design and setting. By the late 17th cent. the goldsmith and enameler gave way before the lapidary and mounter. A process of making imitation pearls was first discovered in 1680; thereafter, ropes of pearls became highly popular for women.

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Sources

The earliest sources of gem diamonds were India and Borneo, where they were found in river alluvium. All famous diamonds of antiquity were Indian diamonds, including the Great Mogul, the Orlov, the Koh-i-noor, and the Regent or Pitt. Other famous diamonds are the Hope (blue), Dresden (green), and Tiffany (yellow). In the early 18th cent., deposits similar to those in India were found in Brazil, mainly of carbonados, though they may have been known as early as 1670. In 1867, a stone found in South Africa was recognized as a diamond. Within a few years, this began a wild search for diamonds, both in river diggings and inland. In 1870-71, dry diggings, including most of the celebrated mines, were discovered. Well-known South African diamond mines are the Dutoitspan, Bultfontein, De Beers, Kimberley, Jagersfontein, and Premier. Russia, Botswana, Congo (Kinshasa), Australia, and South Africa are now the world's major diamond-producing nations; other important countries include Canada, Angola, Namibia, Ghana, and Brazil. The use of diamonds to finance African rebel groups and fuel civil strife in the 1990s led, in 2001 and 2002, to international agreements (the Kimberley Process) designed to certify legitimately mined diamonds, but so-called blood diamonds remain a source of financing for the conflict in Côte d'Ivoire and Zimbabwe's army was accused in 2009 of brutality and human rights violations in diamond mines it seized control of.
Synthetic diamonds were successfully produced in 1955; a number of small crystals were manufactured when pure graphite mixed with a catalyst was subjected to pressure of about 1 million lb per sq in. and temperature of the order of 5,000°F (3,000°C). Synthetic diamonds are now extensively used in industry.

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Food for thought

The question of whether there is sufficient food to feed the world's ever-increasing population has exercised the minds of philosophers, economists, agronomists, and demographers for many centuries. In 1798, Thomas Malthus, an English political economist, wrote a paper entitled An essay on the principle of population, which still provokes heated debate. Malthus suggested that the world's population, growing at a geometric rate, was increasing at a much faster rate than the world's food production, which only increased arithmetically. Malthus argued that if a balance between population and food was not maintained, and the world's population grew to a size that was not sustainable by contemporary food production practices, then the consequence would be widespread famine.

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History

It is thought that diamonds were first discovered in Indiaabout 6,000 years ago in the riverbeds of the region. Traders were responsible for bringing the gems as far east as China and as far west as Rome during the classical and early medieval eras. The Chinese were the first to hamess the unusually tough nature of the gem and used it as a tool to cut other stones. Pliny the Elder, a Roman scholar, wrote about the diamond in the first century.