GIA Diamond Grading and Identification 3

Question 1

Which of the following best describes a 'pinpoint' inclusion in a diamond?

Accepted Answer

A tiny white or black dot visible under magnification

Answer

A pinpoint is a minute crystal inclusion that appears as a tiny dot when viewed under magnification.

Question 2

What is the purpose of a 'proportion diagram' on a GIA Diamond Grading Report?

Accepted Answer

To show the diamond's actual proportions in a schematic cross-section

Answer

The proportion diagram provides a schematic cross-section of the diamond illustrating its measured proportions.

Question 3

When grading diamond color, GIA graders view the stone:

Accepted Answer

Table-down against a white background using north daylight-equivalent light

Answer

GIA color grading is performed table-down (pavilion-up) against a white background under controlled, north daylight-equivalent light.

Question 4

A 'bearding' blemish on a diamond refers to:

Accepted Answer

Tiny feathers extending inward from the girdle, creating a fuzzy appearance

Answer

Bearding consists of minute feathers extending from the girdle into the stone, often caused by bruting.

Question 5

Which GIA clarity grade range is considered 'eye-clean' for most diamonds?

Accepted Answer

FL to SI2

Answer

Diamonds graded FL through SI2 are generally considered eye-clean, meaning inclusions are not visible to the unaided eye.

(GIA) Certified Diamonds Gemological Institute of America Practice Test