CDG Diamond Grading & Evaluation Techniques 2

Question 1

When using a loupe to grade clarity, at what magnification is the standard GIA grading performed?

Accepted Answer

10x

Answer

GIA standards require clarity grading under 10x magnification using a properly corrected loupe or microscope.

Question 2

An inclusion that is black or dark and appears as a distinct spot under magnification is most likely which type?

Accepted Answer

Carbon spot (black crystal)

Answer

A black crystal, sometimes called a carbon spot, is a dark mineral inclusion visible under magnification and affects clarity grade.

Question 3

Which clarity characteristic describes a small, white, cloud-like grouping of tiny pinpoints that can affect transparency?

Accepted Answer

Cloud

Answer

A cloud is a hazy, diffuse grouping of many tiny pinpoints that collectively can reduce transparency and affect the clarity grade.

Question 4

During clarity grading, a grader notices a fracture that reaches the surface of the diamond. This is classified as a:

Accepted Answer

Feather

Answer

A feather is an internal fracture or cleavage that breaks the surface and appears feathery or wispy under magnification.

Question 5

When grading a diamond for clarity, which position provides the best view to detect inclusions near the girdle?

Accepted Answer

Tilted at 45 degrees

Answer

Tilting the diamond at various angles, including 45 degrees, helps reveal inclusions near the girdle that may be hidden in the face-up or face-down positions.

(CDG) Certified Diamond Grader Practice Test

(CDG) Certified Diamond Grader Practice Test

CDG Diamond Grading & Evaluation Techniques 2