GIA Diamonds and Diamond Grading Final Exam || 2025 (Actual Exam)
Questions with verified Answers (Latest Update 2025) UPDATE!! Final Ex
#2
1. London Diamond What group was critical to De Beers's early sales strategy?
Syndicate
2. Color How are gem-quality rough diamonds sorted?
3. Baby Boomers What generation was first to connect with diamonds as a representation of lifetime
commitment?
4. India Where did the diamond industry first start?
5. Single-channel What describes the concept of centrally controlled supply, purchase, promotion,
marketing and sales of rough diamonds?
6. Lower mantle What mantle layer is most dense?
7. Will turn into What happens to diamond if lamproite stalls in the continental crust?
graphite
8. When a continen- When does subduction occur?
tal and oceanic
plate collide
9. High heat and How are metamorphic rocks formed?
high pressure
10. CLIPPIR dia- What is an example of a superdeep diamond?
monds, blue di-
amonds, Brazil's
Junia diamond
11. A good sign that What might black spinel in a mineral sample indicate?
a pipe is nearby
, GIA Diamonds and Diamond Grading Final Exam || 2025 (Actual Exam)
Questions with verified Answers (Latest Update 2025) UPDATE!! Final Ex
#2
12. Robotic/automat- What equipment might offshore deep-sea diamond mining use?
ed crawlers
13. Primary deposits What deposit type produces most diamonds mined today?
14. Character sam- What type of sampling gives an initial idea of diamond quality for a deposit?
pling
15. Brazil Where are rocks and geological structures similar to Africa found due to ancient
connections?
16. Crystal structure What is another term for crystal lattice?
17. Type Ia What type are most natural diamonds?
18. Cleavage What is a smooth, flat break in a crystal parallel to a cleavage plane?
19. Macle What is a flat, triangular, twinned diamond crystal?
20. Intrinsic defect What types of point defects are found in diamonds?
and extrinsic de-
fects
21. Color center What influences light absorption, resulting in bodycolor?
22. Hydrogen-relat- What trace element can cause a violet color in diamonds?
ed defects
23. Lower How does the energy emitted by a gem compare to the energy it absorbs?
24. White light What type of light combines all the colors in the visible spectrum?
25. Nitrogen defects What is the most common cause of yellow color in diamonds?
, GIA Diamonds and Diamond Grading Final Exam || 2025 (Actual Exam)
Questions with verified Answers (Latest Update 2025) UPDATE!! Final Ex
#2
26. Cutting What controls light path length within a diamond?
27. Luster What term describes a gemstone's surface in reflected light?
28. Fire What describes the flashes of spectral colors seen in a polished diamond?
29. Determine which What was the main goal of research in developing the GIA Cut Grading System?
proportion com-
binations create
the most attrac-
tive light perfor-
mance
30. Measured btwn What best describes the angle of incidence?
the normal and
the reflected
light
31. Cleaving What process splits diamond rough along its cleavage plane?
32. Strain What do cutters evaluate to determine when to use a scaife for coning?
33. Bruting What made true round-shaped diamonds possible?
34. Old European cut What was the prototype of the modern round brilliant cut?
35. Holds/secures a What does a dop do?
diamond in place
36. High pressure, What does HPHT stand for?
high tempera-
ture
Questions with verified Answers (Latest Update 2025) UPDATE!! Final Ex
#2
1. London Diamond What group was critical to De Beers's early sales strategy?
Syndicate
2. Color How are gem-quality rough diamonds sorted?
3. Baby Boomers What generation was first to connect with diamonds as a representation of lifetime
commitment?
4. India Where did the diamond industry first start?
5. Single-channel What describes the concept of centrally controlled supply, purchase, promotion,
marketing and sales of rough diamonds?
6. Lower mantle What mantle layer is most dense?
7. Will turn into What happens to diamond if lamproite stalls in the continental crust?
graphite
8. When a continen- When does subduction occur?
tal and oceanic
plate collide
9. High heat and How are metamorphic rocks formed?
high pressure
10. CLIPPIR dia- What is an example of a superdeep diamond?
monds, blue di-
amonds, Brazil's
Junia diamond
11. A good sign that What might black spinel in a mineral sample indicate?
a pipe is nearby
, GIA Diamonds and Diamond Grading Final Exam || 2025 (Actual Exam)
Questions with verified Answers (Latest Update 2025) UPDATE!! Final Ex
#2
12. Robotic/automat- What equipment might offshore deep-sea diamond mining use?
ed crawlers
13. Primary deposits What deposit type produces most diamonds mined today?
14. Character sam- What type of sampling gives an initial idea of diamond quality for a deposit?
pling
15. Brazil Where are rocks and geological structures similar to Africa found due to ancient
connections?
16. Crystal structure What is another term for crystal lattice?
17. Type Ia What type are most natural diamonds?
18. Cleavage What is a smooth, flat break in a crystal parallel to a cleavage plane?
19. Macle What is a flat, triangular, twinned diamond crystal?
20. Intrinsic defect What types of point defects are found in diamonds?
and extrinsic de-
fects
21. Color center What influences light absorption, resulting in bodycolor?
22. Hydrogen-relat- What trace element can cause a violet color in diamonds?
ed defects
23. Lower How does the energy emitted by a gem compare to the energy it absorbs?
24. White light What type of light combines all the colors in the visible spectrum?
25. Nitrogen defects What is the most common cause of yellow color in diamonds?
, GIA Diamonds and Diamond Grading Final Exam || 2025 (Actual Exam)
Questions with verified Answers (Latest Update 2025) UPDATE!! Final Ex
#2
26. Cutting What controls light path length within a diamond?
27. Luster What term describes a gemstone's surface in reflected light?
28. Fire What describes the flashes of spectral colors seen in a polished diamond?
29. Determine which What was the main goal of research in developing the GIA Cut Grading System?
proportion com-
binations create
the most attrac-
tive light perfor-
mance
30. Measured btwn What best describes the angle of incidence?
the normal and
the reflected
light
31. Cleaving What process splits diamond rough along its cleavage plane?
32. Strain What do cutters evaluate to determine when to use a scaife for coning?
33. Bruting What made true round-shaped diamonds possible?
34. Old European cut What was the prototype of the modern round brilliant cut?
35. Holds/secures a What does a dop do?
diamond in place
36. High pressure, What does HPHT stand for?
high tempera-
ture
