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Diamond Essentials > Color and Value > Flashcards

Color and Value Flashcards

1
Q

What does each letter grade in the GIA Color Scale represent?

A

A range of color

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2
Q

The annealing of irradiated diamonds to stabilize their color is done by…

A

Heating

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3
Q

What is the most common color of fluorescence in gem-quality diamond?

A

Blue

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4
Q

What two colors are the most rare in diamonds?

A

Red and purple

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5
Q

When mounted, how do G, H, and I color diamonds look?

A

Colorless face-up

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6
Q

Which of the D, F, G, H color grades indicate the greatest amount of yellow?

A

H

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7
Q

What are the most commonly encountered colors among colored diamonds?

A

Brown and yellow

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8
Q

What is the combination of tone and saturation that determines how noticeable a color is?

A

Depth of color

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9
Q

To color grade a light yellow or brown diamond, graders compare it to a master stone, for what?

A

Tone and saturation

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10
Q

What color grade can most consumers easily see color beyond?

A

M

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11
Q

Why do prices differentiate between colorless diamonds and near-colorless diamonds?

A

Rarity

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12
Q

What is the normal color range of diamonds?

A

Colorless to light yellow, brown, and gray.

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13
Q

Which masterstone does the GIA laboratory use to determine the point where a yellow diamond transitions to the color diamond grading scale?

A

Z

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14
Q

What have irradiated diamonds been exposed to, that has caused them to change color?

A

Heat

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15
Q

On the GIA Color Scale, what is the top grade in the normal color range?

A

D

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16
Q

What are D, E, F, and G on the GIA Color Scale?

A

Colorless

17
Q

What are G, H, I, and J on the GIA Color Scale?

A

Near Colorless

18
Q

What are K, L, M, and N on the GIA Color Scale?

A

Faint

19
Q

What are O, P, Q, R, S, T, and U on the GIA Color Scale?

A

Very Light

20
Q

What are V, W, X, Y, and Z on the GIA Color Scale?

A

Light

21
Q

What are the three things consistent color grading depends on?

A

The masterstones, the environment, and the grader

22
Q

What are the nine color grading terms that describe colored diamonds?

A

Faint, Very Light, Light, Fancy Light, Fancy, Fancy Intense, Fancy Vivid, Fancy Dark, Fancy Deep

23
Q

What are the three grades that apply to all colors except yellow?

A

Faint, Very Light, and Light

24
Q

High Pressure and High Temperature (HPHT)

A

Used to lighten, remove or create diamond color

25
Q

What colors do many companies worldwide use HPHT treatments to create?

A

Green, yellow, blue, and pink

26
Q

Annealing

A

A gemstone heating process that can be used alone or to stabilize irradiated color.

27
Q

Characteristic Color

A

The basic face-up color of a colored diamond.

28
Q

Colored Diamonds

A

Yellow, brown, and gray diamonds with more color than the Z masterstone, or that exhibit any other color face-up.

29
Q

Depth of Color

A

The combination of tone and saturation that determines how noticeable a color is.

30
Q

Fluorescence

A

Emission of visible light by a material when it’s exposed to ultraviolet radiation.

31
Q

Hue

A

Your first impression of a color; the basic color of an object.

32
Q

Irradiation

A

A treatment that changes the color of a gem by exposing it to radioactive materials.

33
Q

Masterstones

A

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

34
Q

Near-Colorless

A

A general term for diamonds in the G-J color range.

35
Q

Normal Color Range

A

Range of a diamond colors from colorless to light yellow, brown, and gray.

36
Q

Saturation

A

A color’s strength or intensity, ranging from a dull hue to a pure, vivid hue.

37
Q

Tone

A

A color’s degree of darkness or lightness.

38
Q

Ultraviolet (UV)

A

Light wavelength that’s invisible to the human eye.

Diamond Essentials (5 decks)

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