GIA Diamond Proportions & Cut Analysis 3

Question 1

Which characteristic is NOT one of the seven components GIA evaluates when determining the cut grade of a round brilliant diamond?

Accepted Answer

Fluorescence

Answer

GIA evaluates brightness, fire, scintillation, weight ratio, durability, polish, and symmetry for cut grading; fluorescence is assessed and graded separately.

Question 2

In diamond grading, what does 'polish' refer to?

Accepted Answer

The overall smoothness and condition of a diamond's facet surfaces

Answer

Polish refers to the overall condition and smoothness of a diamond's facet surfaces as finished by the polisher, graded on a scale from Excellent to Poor.

Question 3

What does 'symmetry' measure as a grading factor in diamond cut assessment?

Accepted Answer

The precision of the shape, alignment, and arrangement of facets

Answer

Symmetry in diamond grading refers to the exactness of the shape and arrangement of facets, including their alignment and overall cutting precision, graded from Excellent to Poor.

Question 4

What are the 'lower girdle facets' (lower half facets) in a round brilliant diamond?

Accepted Answer

The kite-shaped facets on the pavilion that adjoin the girdle

Answer

Lower girdle (lower half) facets are the kite-shaped facets on the pavilion extending from the pavilion mains toward the girdle; a standard round brilliant has 16 of these.

Question 5

What does 'pavilion depth percentage' measure in diamond proportions?

Accepted Answer

The distance from the girdle plane to the culet as a percentage of the average girdle diameter

Answer

Pavilion depth percentage measures the vertical distance from the girdle plane to the culet, expressed as a percentage of the average girdle diameter.

(GIA) Certified Diamonds Gemological Institute of America Practice Test

(GIA) Certified Diamonds Gemological Institute of America Practice Test

GIA Diamond Proportions & Cut Analysis 3