REVIEW QUESTIONS

1. Define gemology, gem material (each of the four materials also need defining).

2. How are the given crystal systems classified?

3. Which crystal system is most symmetric, least symmetric?

4. What is the most abundant chemical group?

5. What is a rock?

6. Define a gemstone.

7. What are the six value factors of a gemstone?

8. Define species, variety.

9. What are the two groups?

10. Identify the following about beryl, corundum, garnet, and quartz: crystal system, chemical group, varieties.

11. What do trade names refer to?

12. What are the birthstones for the 12 months?

13. Which months have 2 birthstones? 3 birthstones?

14. Diamond belongs to which crystal class? Which chemical group?

15. What are the four top producers of diamonds? What percentage of diamonds are used for jewelry, industry?

16. What are the four parts of cut?

17. What is the most expensive color of diamond?

18. What is clarity?

19. What are the main parts of a faceted stone?

20. What is a cabochon?

21. Six different gemstone varieties were discussed in the video, "Gemstones of America?" Where are they found?

22. What are the three components of color?

23. Briefly describe the 5 classifications of transparency?

24. What is the first and second highest types of luster?

25. Most gemstones have which luster.

26. What instrument usually eliminates the most gemstones in the identification procedure?

27. What is the most important instrument for separating natural and synthetic materials?

28. Singly refractive gemstones belong to which crystal system?

29. What is the standard magnification?

30. What are the two instruments used for magnification?

31. What is specific gravity?

32. What are the three tests for specific gravity?

33. What is phenomena?

34. What are the three causes of phenomena?

35. What are the nine types of phenomena?

36. Which phenomena must be cut en cabochon?

37. What are the two basic sources of light?

38. What is reflected light and refracted light?

39. What is the refractive index?

40. What is birefringence?

41. What are the three rock classes?

42. What are primary deposits and secondary deposits?

43. What are the top four modes of formation for gemstone sources?

44. What are the top five gemstone sources in the world?

45. How are most gemstones mined?

46. What are two important synthetic processes discussed?

47. What is a doublet, triplet?

48. What is gemstone enhancement?

49. What is the purpose of oiling emeralds?

50. What is probably the most common form of treatment?