GIA 4Cs of Diamond Quality 4

Question 1

Which of the following inclusions in a diamond is most likely to raise concerns about structural integrity?

Accepted Answer

A large feather extending to the surface

Answer

A feather (fracture) that extends to the surface can be a vulnerability point where the diamond may chip or cleave under impact.

Question 2

GIA grades diamond color by comparing the stone to a set of reference stones called:

Accepted Answer

GIA master color comparison diamonds

Answer

GIA grades diamond color by comparing the unknown stone face-down to a set of master color comparison diamonds with known grades.

Question 3

What does the term 'fire' mean when GIA evaluates cut quality?

Accepted Answer

The dispersion of light into the colors of the spectrum

Answer

Fire refers to the dispersion of light into the spectral colors — the rainbow flashes — seen in a well-cut diamond.

Question 4

A round brilliant diamond has a girdle graded 'extremely thin.' This is significant because:

Accepted Answer

It makes the girdle vulnerable to chipping during setting or wear

Answer

An extremely thin girdle is fragile and prone to chipping, especially during the setting process or from everyday knocks.

Question 5

Which of the following statements about carat weight is TRUE?

Accepted Answer

Carat weight measures mass, not size or dimensions

Answer

Carat is a unit of mass (200 mg per carat); the face-up size depends on cut proportions and shape, not carat weight alone.

(GIA) Certified Diamonds Gemological Institute of America Practice Test