GIA DIAMONDS AND DIAMOND GRADING 2025 FINAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS ALREADY GRADED A+ < LATEST VERSION >

GIA DIAMONDS AND DIAMOND GRADING 2025 FINAL EXAM QUESTIONS WITH CORRECT DETAILED ANSWERS ALREADY GRADED A+ &lt; LATEST VERSION &gt; 1. How are gem-quality rough diamonds sorted? - ANSWER weight, shape, clarity, and color 2. What is a downstream segment of the mine to market diamond journey? - ANSWER Selling to a customer via diamond jewelry retail 3. What describes a larger organization buying and joining smaller companies? - ANSWER Consolidation 4. Before the discovery of South Africa's diamond deposits, the world's two major producers were India and - ANSWER Brazil 5. Diamond sources started appearing in South Africa during the - ANSWER � � 1860s 6. The Central Selling Organisation was a - ANSWER rough diamond distribution agency 7. The South African diamond rush was sparked by - ANSWER the discovery of the Star of South Africa 8. The soft, diamond-bearing material near the surface of a diamond field was named - ANSWER yellowground 9. Cecil Rhodes' main competitor in his early attempts to control diamond production was - ANSWER Barney Barnato 10. Who established De Beers Consolidated Mines Ltd. In 1888? - ANSWER Cecil Rhodes 11. De Beers Consolidated Mines Ltd. Was named after - ANSWER the owners of a farm where one of the first diamond rushes took place 12. The group that united in 1890 to buy and sell all of the output of the major diamond producers, including De Beers, was the - ANSWER London Diamond Syndicate 13. Oppenheimer's answer to low diamond demand in the 1930s was to - ANSWER shut down operations at De Beers mines 14. The Diamond Information Center and the Diamond Promotion Service were created to - ANSWER assist in diamond marketing efforts 15. The path diamonds followed from mine to consumer was called the - ANSWER diamond pipeline 16. Sightholders purchase diamond rough by - ANSWER attending invitation-only trading events 17. De Beers requires its sightholders to have an excellent reputation in the industry and - ANSWER the financial strength to make large purchase commitments 18. In the diamond trade, the word "specials" refers to - ANSWER diamond rough over 10.80 cts 19. Which diamond mine's huge production influenced the world market in the late 1980s? - ANSWER Argyle 20. A commitment to reserve a portion of the resources derived from any country for the economic development of that country is called - ANSWER � � beneficiation 21. A city, region, or country with a large number of gemstone manufacturers is called a - ANSWER cutting center 22. One of the changes that resulted from De Beers' strategic review in 1999 was that De Beers - ANSWER changed the name of the CSO to the DTC 23. In 2000, De Beers altered its consumer advertising by - ANSWER introducing the "Forevermark" logo 24. The diamond industry program designed to ensure that diamonds do not fund civil conflict or terrorism is called - ANSWER the Kimberley Process 25. Businesses that sell to consumers via television or computer are called - ANSWER electronic retailers 26. De Beers became a privately owned company in - ANSWER May 2001 27. Vast quantities of small, inexpensive diamonds suitable for low-cost, mass market jewelry are mined in - ANSWER Australia 28. The involvement of a business or industry in all aspects of its product's market is called - ANSWER vertical integration 29. By 2004, more than 90 percent of manufacturing for the diamond market was done in - ANSWER India 30. The program adopted by De Beers in 2007 to answer critics and resolve shortcomings of its COS program is called - ANSWER Supplier of Choice 2 31. 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 - ANSWER Black Economic Empowerment 32. Because the Australians believed the CSO's marketing favored large stones over smaller ones, they - ANSWER aggressively promoted jewelry set with their own tiny gems 33. A bourse is a(n) - ANSWER diamond buying and selling club 34. How far beneath the earth's surface do diamonds form? - ANSWER 90 to 140 miles 35. The deep vertical formations through which diamonds traveled to the surface are called - ANSWER pipes 36. The first authenticated diamond discovered in South Africa is the - ANSWER Eureka 37. Most of the world's kimberlite pipes - ANSWER do not contain diamonds in profitable quantities 38. The correct conditions for diamond formation exist under - ANSWER cratons 39. Scientists have found that diamonds form in two types of rocks, called - ANSWER peridotite and eclogite 40. The large, stable parts of the earths' continental crust are called - ANSWER � � cratons 41. Diamond and graphite are both made of - ANSWER carbon 42. Diamond is hard and graphite is soft because of the difference in - ANSWER the way their atoms fit together 43. The proper environment for diamond formation includes the right temperature, pressure, and - ANSWER the availability of carbon 44. Subduction occurs when - ANSWER two of the earth's crustal plates collide 45. Diamonds were delivered to the earth's surface as recently as - ANSWER 20 million years ago 46. The three main components of the earth are the crust, mantle, and - ANSWER core 47. Before arriving at the earth's surface, diamonds might remain in the mantle for as long as a few - ANSWER hundred million years 48. During emplacement, if diamonds are exposed to high temperature along with decreased pressure for a long period, they will - ANSWER convert to graphite