GIA 4Cs of Diamond Quality 2 — Questions and Answers
Question 1: Which GIA clarity grade describes a diamond with inclusions that are 'obvious under 10x magnification' and may affect transparency or brilliance?
- SI2
- I1 (Correct answer)
- VS2
- I2
Correct answer: I1
GIA's I1 grade describes diamonds where inclusions are obvious under 10x magnification and may affect transparency or brilliance.
Question 2: A diamond graded 'G' on the GIA color scale would be described as:
- Colorless
- Near colorless (Correct answer)
- Faint
- Very light
Correct answer: Near colorless
GIA grades D-F as colorless, G-J as near colorless, so a G-color diamond falls in the near colorless range.
Question 3: What does 'fluorescence' mean in the context of GIA diamond grading?
- The diamond's refractive index measurement
- The diamond's visible glow under UV light (Correct answer)
- The reflection pattern on the table facet
- The spread of light through the pavilion
Correct answer: The diamond's visible glow under UV light
Fluorescence describes a diamond's tendency to emit a soft glow (usually blue) when exposed to ultraviolet light.
Question 4: When GIA grades 'cut' for round brilliant diamonds, which of the following is NOT one of the three components evaluated?
- Brightness
- Fire
- Fluorescence (Correct answer)
- Scintillation
Correct answer: Fluorescence
GIA's cut grade for rounds evaluates brightness, fire, and scintillation — fluorescence is a separate characteristic.
Question 5: A diamond with a depth percentage of 58% and a table percentage of 57% would most likely receive which GIA cut grade?
- Poor
- Good
- Very Good
- Excellent (Correct answer)
Correct answer: Excellent
A depth near 61% and table near 57% fall within GIA's Excellent cut grade proportions for round brilliants.
Question 6: What is the GIA term for the weight measurement equal to 200 milligrams?
- Point
- Grain
- Carat (Correct answer)
- Metric ton
Correct answer: Carat
One metric carat equals exactly 200 milligrams (0.2 grams), the standard unit for gemstone weight.
Question 7: Which clarity characteristic is defined as a clarity feature that originates INSIDE the diamond?
- Blemish
- Inclusion (Correct answer)
- Nick
- Scratch
Correct answer: Inclusion
GIA defines inclusions as internal clarity characteristics, while blemishes are external surface features.
GIA 4Cs of Diamond Quality 2
Which GIA clarity grade describes a diamond with inclusions that are 'obvious under 10x magnification' and may affect transparency or brilliance?