GIA 4Cs of Diamond Quality 2

Question 1

Which GIA clarity grade describes a diamond with inclusions that are 'obvious under 10x magnification' and may affect transparency or brilliance?

Accepted Answer

I1

Answer

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:

Accepted Answer

Near colorless

Answer

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?

Accepted Answer

The diamond's visible glow under UV light

Answer

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?

Accepted Answer

Fluorescence

Answer

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?

Accepted Answer

Excellent

Answer

A depth near 61% and table near 57% fall within GIA's Excellent cut grade proportions for round brilliants.

(GIA) Certified Diamonds Gemological Institute of America Practice Test