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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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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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Crushing

In the crushing operation, which occurs in the below-ground mining facilities, large chunks of kimberlite are broken up into more easily transportable segments. After an initial crushing, the kimberlite passes through a grizzly, or a set of iron bars. If the crushed chunks do not pass through the grizzly, they are still too large, and they are sent back for further crushing. The crushed kimberlite is then taken above the surface for further processing. When no more kimberlite is found entering the cones, the area is depleted and work moves on to a lower level.

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Natural Occurrence and Processing

Diamonds are found in alluvial (loose earthy material deposited by running water) formations and in volcanic pipes, filled for most of their length with blue ground or kimberlite, an igneous rock consisting largely of serpentine. At the surface the blue ground is weathered to a clay called yellow ground. Diamantiferous (or diamondiferous), or diamond-yielding, earth is mined both by the open-pit method and by underground mining. After being removed to the surface, it is crushed and then concentrated. Sorting is done by passing the concentrated material in a stream of water over greased tables. The diamond, being largely water repellent, sticks to the grease, but the other minerals retain a film of water, which prevents them from adhering to the grease. The diamonds are then removed from the grease, cleaned, and graded for sale.

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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.

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Cell Technology

Geographic areas are divided into a number of slightly overlapping circular "cells." Each cell contains a base station, which is identifiable by its transmitting and receiving antenna located on a tower at the top of a hill or building. The base stations connect to the landline telephone system of the country.

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Major Carriers

In the U.S., the major cellular carriers are AT&T (formerly Cingular), Verizon Wireless (formerly Bell Atlantic Mobile and Alltel), Sprint Nextel (merger of Sprint and Nextel), T-Mobile and Virgin Mobile USA. The largest cellular company in the world is UK-based Vodafone, which includes substantial ownership in Verizon Wireless.