GIA Diamond Grading & Classification 2

Question 1

On the GIA color grading scale, which letter grade represents a completely colorless diamond?

Accepted Answer

D

Answer

GIA's color scale begins at D (colorless) and extends to Z (light yellow or brown); there are no A, B, or C grades.

Question 2

A diamond described as 'VS1' on a GIA report has inclusions that are:

Accepted Answer

Very difficult to see under 10x magnification

Answer

VS1 (Very Slightly Included 1) inclusions are minor and difficult—but not impossible—for a skilled grader to locate under 10x magnification.

Question 3

What does the term 'make' refer to when evaluating a diamond's cut quality?

Accepted Answer

The overall quality of a diamond's proportions and finish

Answer

In the trade, 'make' describes how well a diamond has been cut, encompassing proportions, symmetry, and polish.

Question 4

On a GIA grading report, 'fluorescence' describes how a diamond reacts to:

Accepted Answer

Ultraviolet light

Answer

GIA grades diamond fluorescence based on the stone's visible emission of light when exposed to long-wave UV radiation.

Question 5

Which clarity characteristic is ALWAYS located on the surface of a diamond rather than internally?

Accepted Answer

Scratch

Answer

A scratch is a surface blemish caused by abrasion, whereas clouds, crystals, and feathers are internal inclusions.

(GIA) Certified Diamonds Gemological Institute of America Practice Test