Grading Color (Chapter 13, Key Terms & Key Concepts)

Question 1

The basic face-up color of a
colored diamond.

Answer 1

Characteristic color

Question 2

A position that orients
a gemstone’s pavilion toward the viewer.

Answer 2

Face-down (or table-down)

Question 3

A position that orients a
gemstone’s crown toward the viewer.

Answer 3

Face-up (or table-up)

Question 4

The optical illusion that causes
the ungraded diamond to appear either lighter or
darker than the masterstone, depending on which
side it’s on.

Answer 4

Master-eye effect

Question 5

A set of color-comparison diamonds
that defines GIA diamond color grades in the normal
(D-to-Z) range.

Answer 5

Masterstones

Question 6

Slight color differences can equal large value differences.

Answer 6

Key Concept

Question 7

The GIA diamond color-grading system is the universal
standard in the jewelry industry.

Answer 7

Key Concept

Question 8

Each letter on the scale represents a narrow range of color,
and each masterstone marks the least amount of color in that
range.

Answer 8

Key Concept

Question 9

The biggest price difference occurs between the D and E
grades, all other factors being equal.

Answer 9

Key Concept

Question 10

The GIA color-grading system helps diamond professionals
communicate accurately about diamond color.

Answer 10

Key Concept

Question 11

The color-grading environment should affect the color grade
as little as possible.

Answer 11

Key Concept

Question 12

The most widely accepted lighting for color-grading diamonds
is balanced, daylight-equivalent, fluorescent light.

Answer 12

Key Concept

Question 13

The set of masterstones should be matched to the specific
color-grading requirements of the user.

Answer 13

Key Concept

Question 14

The masterstones and the diamond to be graded must be
clean for best results.

Answer 14

Key Concept

Question 14

The masterstones and the diamond to be graded must be
clean for best results.

Answer 14

Key Concept

Question 15

It’s possible to estimate diamond color, and the results can
be fairly accurate

Answer 15

Key Concept

Question 16

Proportion variations, size, and clarity characteristics can
influence a diamond’s color appearance.

Answer 16

Key Concept

Question 17

Cut can influence the color of colored diamonds, so they’re
graded face-up.

Answer 17

Key Concept

Question 18

The goal of colored diamond color grading is to arrive at a
repeatable, consistent grade.

Answer 18

Key Concept

Question 19

Subtle color differences are usually more visible when seen

Answer 19

through the pavilion.

Question 20

A loose brown diamond should be color-graded

Answer 20

in the normal color range./retest

Question 21

Which of the following GIA color grades indicates the greatest amount of yellow?

Answer 21

H

Question 22

Which of the following makes a diamond unsuitable for a masterstone set?

Answer 22

crowns and pavilions must not be shallow or deep./retest

Question 23

The diamonds used as comparison stones for color grading are called

Answer 23

masterstones.

Question 24

Colorless diamonds are more valuable than others in the normal color range because they

Answer 24

are more rare.

Question 25

The most widely accepted lighting for color-grading diamonds is

Answer 25

balanced, daylight-equivalent fluorescent light.

Question 26

The color grade of a diamond that appears darker than the H masterstone but lighter than the I would be

Answer 26

H.

Question 27

When color-grading with masterstones, you should

Answer 27

grade table down through the pavilion/retest

Question 28

Trade terms that describe diamond color

Answer 28

can be misleading.

Question 29

If a diamond has a slight tint in the face-down position and appears colorless in the face-up position, its estimated color grade would be

Answer 29

G, H, I, or J.

Question 30

GIA Gem Trade Laboratory uses a Z masterstone to determine fancy

Answer 30

yellows.

Question 31

Diamonds outside the normal color range are graded

Answer 31

face-up.

Question 32

The basic face-up color of a colored diamond is known as its

Answer 32

characteristic color/retest

Question 33

A masterstone graded as whole grade represents the

Answer 33

the least amount of color possible in that grade’s range./retest