GIA Diamond Essentials Final Exam
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the chemical composition of a diamond?
✔✔Pure carbon arranged in a crystal lattice
What property allows diamonds to refract light and sparkle?
✔✔High refractive index
What is the hardest natural material on the Mohs scale?
✔✔Diamond
What is the typical crystal system of a diamond?
✔✔Isometric (cubic)
Which type of diamond shows no visible color?
✔✔Colorless diamond
What is the term for internal characteristics of a diamond?
✔✔Inclusions
What is the main factor that determines a diamond's value?
1
,✔✔The 4 Cs: Carat, Cut, Color, Clarity
Which clarity grade indicates a diamond is flawless under 10x magnification?
✔✔Flawless (FL)
What does carat measure in a diamond?
✔✔Weight
Which cut feature affects a diamond’s brilliance the most?
✔✔Proportions of facets
What does the term “fire” describe in diamonds?
✔✔Dispersion of light into spectral colors
Which type of diamond is known for a pink, blue, or green hue?
✔✔Fancy colored diamond
What is the most common inclusion in diamonds?
✔✔Feather
Which diamond treatment can enhance color?
✔✔High-pressure high-temperature (HPHT) treatment
2
, What is the term for the highest part of a diamond above the girdle?
✔✔Crown
What is the flat polished surface on top of a diamond called?
✔✔Table
What is the narrow perimeter dividing the crown and pavilion?
✔✔Girdle
Which part of the diamond extends from the girdle to the culet?
✔✔Pavilion
What is the bottom tip of a diamond called?
✔✔Culet
Which tool is used to examine a diamond’s clarity?
✔✔10x loupe
What is the effect of a well-cut diamond on light performance?
✔✔Maximizes brilliance, fire, and scintillation
3
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the chemical composition of a diamond?
✔✔Pure carbon arranged in a crystal lattice
What property allows diamonds to refract light and sparkle?
✔✔High refractive index
What is the hardest natural material on the Mohs scale?
✔✔Diamond
What is the typical crystal system of a diamond?
✔✔Isometric (cubic)
Which type of diamond shows no visible color?
✔✔Colorless diamond
What is the term for internal characteristics of a diamond?
✔✔Inclusions
What is the main factor that determines a diamond's value?
1
,✔✔The 4 Cs: Carat, Cut, Color, Clarity
Which clarity grade indicates a diamond is flawless under 10x magnification?
✔✔Flawless (FL)
What does carat measure in a diamond?
✔✔Weight
Which cut feature affects a diamond’s brilliance the most?
✔✔Proportions of facets
What does the term “fire” describe in diamonds?
✔✔Dispersion of light into spectral colors
Which type of diamond is known for a pink, blue, or green hue?
✔✔Fancy colored diamond
What is the most common inclusion in diamonds?
✔✔Feather
Which diamond treatment can enhance color?
✔✔High-pressure high-temperature (HPHT) treatment
2
, What is the term for the highest part of a diamond above the girdle?
✔✔Crown
What is the flat polished surface on top of a diamond called?
✔✔Table
What is the narrow perimeter dividing the crown and pavilion?
✔✔Girdle
Which part of the diamond extends from the girdle to the culet?
✔✔Pavilion
What is the bottom tip of a diamond called?
✔✔Culet
Which tool is used to examine a diamond’s clarity?
✔✔10x loupe
What is the effect of a well-cut diamond on light performance?
✔✔Maximizes brilliance, fire, and scintillation
3
