GIA Diamond Grading Quiz 2 - Questions and Answers

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GIA Diamond Grading Quiz 2 - Questions and Answers Before the discovery of South Africa's diamond deposits, the world's two major producers were India and Brazil Diamond sources started appearing in... South Africa during the 1860s The Central Selling Organization was a rough diamond distribution agency. The South African diamond rush was sparked by the discovery of the Star of South Africa. The soft, diamond-bearing material near the surface of a diamond field was named Yellowground Cecil Rhodes' main competitor in his early attempts to control diamond production was Barney Barnato. Who established De Beers Consolidated Mines Ltd. in 1888? Cecil Rhodes De Beers Consolidated Mines Ltd. was named after the owners of a farm where one of the first diamond rushes took place. The group that united in 1890 to buy and sell all of the output of the major diamond producers, including De Beers, was the London Diamond Syndicate. Oppenheimer's answer to low diamond demand in the 1930s was to shut down operations at De Beers mines. The Diamond Information Center and the Diamond Promotion Service were created to assist in diamond marketing efforts. The path diamonds followed from mine to consumer was called the diamond pipeline. Sightholders purchase diamond rough by attending invitation-only trading events. De Beers requires its sightholders to have an excellent reputation in the industry and the financial strength to make large purchase commitments. In the diamond trade, the word "specials" refers to diamond rough over 10.80 cts. Which diamond mine's huge production influenced the world market in the late 1980s? Argyle. A commitment to reserve a portion of the resources derived from any country for the economic development of that country is called beneficiation. A city, region, or country with a large number of gemstone manufacturers is called a cutting center. One of the changes that resulted from De Beers' strategic review in 1999 was that De Beers changed the name of the CSO to the DTC. In 2000, De Beers altered its consumer advertising by introducing the "Forevermark" logo. The diamond industry program designed to ensure that diamonds do not fund civil conflict or terrorism is called the Kimberley Process. Businesses that sell to consumers via television cable, phone line, or satellite are called electronic retailers. De Beers became a privately owned company in May 2001. Vast quantities of small, inexpensive diamonds suitable for low-cost, mass-market jewelry are mined in Australia. The involvement of a business or industry in all aspects of its product's market is called vertical integration. By 2004, more than 90 percent of manufacturing for the diamond market was done in India. The program adopted by De Beers in 2007 to answer critics and resolve shortcomings of its SOC program is called Supplier of Choice 2. In South Africa, a new mining charter that designates the people of the country as the owners of its mineral resources is a result of Black Economic Empowerment. Because the Australians believed the CSO's marketing favored large stones over smaller ones, they aggressively promoted jewelry set with their own tiny gems. A bourse is a(n) diamond buying and selling club. How far beneath the earth's surface do diamonds form? 90 to 120 miles (140 to 190 kilometers) The deep vertical formations through which diamonds traveled to the surface are called pipes. The first authenticated diamond discovered in South Africa is named the Eureka. Most of the world's kimberlite pipes do not contain diamonds in profitable quantities. The correct conditions for diamond formation exist under cratons. Scientists have found that diamonds form in two types of rocks, called peridotite and eclogite. The large, stable parts of the earth's continental crust are called cratons. Diamond and graphite are both made of carbon. Diamond is hard and graphite is soft because of the difference in the way their atoms fit together. The proper environment for diamond formation includes the right temperature, pressure and the availability of carbon. Subduction occurs when two of the earth's crustal plates collide. Diamonds were delivered to the earth's surface as recently as 20 million years ago. The three main components of the earth are the crust, mantle, and core. Before arriving at the earth's surface, diamonds might remain in the mantle for as long as a few hundred million years. During emplacement, if diamonds are exposed to high temperature along with decreased pressure for a long period, they will convert to graphite. Diamond deposits found at the ocean's shore are marine deposits. For more than 2,000 years, the only known diamond sources were alluvial. Diamonds are more concentrated in marine deposits. Only a small percentage of known diamond deposits are mined because most are not profitable. A mine's potential profitability depends in part on its ore grade. Most of the diamonds mined today come from pipes. Diamonds classified as cuttable can be 100 times more valuable than industrial diamonds. Indicator minerals in kimberlite and lamproite include tiny diamonds. The first step in exploring for diamonds is to look for the oldest parts of the earth's crust. Gravity sorting separates diamonds from lighter materials. Diamond rough suitable for use in tools, drills, and abrasives is industrial quality. [Show More]

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