GIA DIAMONDS & DIAMOND GRADING – FINAL EXAM
PRACTICE QUESTIONS AND ANSWERS | FALL 2025/2026
UPDATE | 100% CORRECT
1. What are the 4Cs of diamond quality?
Correct Answers: Color, Clarity, Cut, Carat Weight
2. Which organization created the modern 4Cs and the International Diamond Grading System?
Correct Answers: GIA (Gemological Institute of America)
3. The most valuable diamond color grade in the normal (D-to-Z) range is:
Correct Answers: D (Colorless)
4. Which color grade is the first in the “Faint” category?
Correct Answers: K
5. A diamond with a strong blue fluorescence under UV light will most likely appear:
Correct Answers: Whiter (in daylight for D–H colors), but may look hazy/oily in I–M
colors
6. Which clarity grade means “Very Very Slightly Included” and usually has minor inclusions
difficult for a skilled grader to see at 10×?
Correct Answers: VVS2
7. The clarity grade just below FL (Flawless) is:
Correct Answers: IF (Internally Flawless)
,8. At which clarity grade do inclusions first become visible to the unaided eye in most cases?
Correct Answers: SI2 (and sometimes SI1)
9. The most valuable cut grade for a round brilliant diamond on a GIA report is:
Correct Answers: Excellent
10. What is the ideal total depth percentage range for a round brilliant diamond?
Correct Answers: 59–62.3% (GIA Excellent range)
11. Ideal table percentage range for round brilliant (GIA Excellent)?
Correct Answers: 53–58%
12. The part of the diamond below the girdle is called the:
Correct Answers: Pavilion
13. The top flat facet of a diamond is the:
Correct Answers: Table
14. The pointed bottom of a diamond is the:
Correct Answers: Culet
15. What term describes a diamond that is too deep and loses light out the pavilion?
Correct Answers: Nail head
, 16. A diamond that is too shallow and loses light through the pavilion sides is called:
Correct Answers: Fisheye
17. One carat is equal to:
Correct Answers: 200 milligrams (0.2 grams)
18. The standard unit for measuring diamond diameter is:
Correct Answers: Millimeters (mm)
19. The only diamond shape that GIA gives a full cut grade to is:
Correct Answers: Round Brilliant
20. Which symmetry grade is the highest on a GIA report?
Correct Answers: Excellent
21. Ideal star facet length for GIA Excellent round brilliant
Correct Answers: 50–55%
22. Ideal lower girdle (lower-half) facet length
Correct Answers: 75–80%
23. The 7 components GIA uses to determine overall cut grade (round brilliant)
PRACTICE QUESTIONS AND ANSWERS | FALL 2025/2026
UPDATE | 100% CORRECT
1. What are the 4Cs of diamond quality?
Correct Answers: Color, Clarity, Cut, Carat Weight
2. Which organization created the modern 4Cs and the International Diamond Grading System?
Correct Answers: GIA (Gemological Institute of America)
3. The most valuable diamond color grade in the normal (D-to-Z) range is:
Correct Answers: D (Colorless)
4. Which color grade is the first in the “Faint” category?
Correct Answers: K
5. A diamond with a strong blue fluorescence under UV light will most likely appear:
Correct Answers: Whiter (in daylight for D–H colors), but may look hazy/oily in I–M
colors
6. Which clarity grade means “Very Very Slightly Included” and usually has minor inclusions
difficult for a skilled grader to see at 10×?
Correct Answers: VVS2
7. The clarity grade just below FL (Flawless) is:
Correct Answers: IF (Internally Flawless)
,8. At which clarity grade do inclusions first become visible to the unaided eye in most cases?
Correct Answers: SI2 (and sometimes SI1)
9. The most valuable cut grade for a round brilliant diamond on a GIA report is:
Correct Answers: Excellent
10. What is the ideal total depth percentage range for a round brilliant diamond?
Correct Answers: 59–62.3% (GIA Excellent range)
11. Ideal table percentage range for round brilliant (GIA Excellent)?
Correct Answers: 53–58%
12. The part of the diamond below the girdle is called the:
Correct Answers: Pavilion
13. The top flat facet of a diamond is the:
Correct Answers: Table
14. The pointed bottom of a diamond is the:
Correct Answers: Culet
15. What term describes a diamond that is too deep and loses light out the pavilion?
Correct Answers: Nail head
, 16. A diamond that is too shallow and loses light through the pavilion sides is called:
Correct Answers: Fisheye
17. One carat is equal to:
Correct Answers: 200 milligrams (0.2 grams)
18. The standard unit for measuring diamond diameter is:
Correct Answers: Millimeters (mm)
19. The only diamond shape that GIA gives a full cut grade to is:
Correct Answers: Round Brilliant
20. Which symmetry grade is the highest on a GIA report?
Correct Answers: Excellent
21. Ideal star facet length for GIA Excellent round brilliant
Correct Answers: 50–55%
22. Ideal lower girdle (lower-half) facet length
Correct Answers: 75–80%
23. The 7 components GIA uses to determine overall cut grade (round brilliant)
