GIA 4Cs of Diamond Quality 3

Question 1

Two diamonds are each 0.50 carats but have different diameters. What most likely accounts for this difference?

Accepted Answer

Different cut proportions

Answer

A shallower-cut diamond spreads weight across a wider diameter, while a deeper stone concentrates weight below the girdle.

Question 2

Which of the following best describes a diamond graded 'VS1' by GIA?

Accepted Answer

Minor inclusions difficult to see under 10x magnification

Answer

VS1 (Very Slightly Included 1) describes diamonds where inclusions are minor and difficult to see even under 10x magnification.

Question 3

A 'feather' in diamond clarity grading refers to:

Accepted Answer

A small fracture or crack within the diamond

Answer

A feather is a fracture inside the diamond that, when viewed at certain angles, resembles a feathery pattern.

Question 4

On the GIA color grading scale, which letter grade represents the most colorless diamond possible?

Accepted Answer

D

Answer

GIA's color scale begins at D (most colorless) and extends to Z (light yellow or brown), intentionally avoiding A-C to prevent confusion with older systems.

Question 5

What is 'scintillation' as defined by GIA in evaluating cut quality?

Accepted Answer

The pattern of light and dark areas plus the flashes of light when a diamond moves

Answer

Scintillation encompasses both the sparkle (flashes of light) and the pattern of light and dark areas created as the diamond, observer, or light source moves.

(GIA) Certified Diamonds Gemological Institute of America Practice Test

(GIA) Certified Diamonds Gemological Institute of America Practice Test

GIA 4Cs of Diamond Quality 3