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Diamonds & Diamond Grading > Diamonds and Light (Chapter 8, Key Terms & Key Concepts) > Flashcards

Diamonds and Light (Chapter 8, Key Terms & Key Concepts) Flashcards

1
Q

The highest degree of luster
possible in a transparent material.

A

Adamantine luster

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2
Q

The angle at which a ray of light
strikes a surface, measured from the normal.

A

Angle of incidence

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3
Q

The angle between the normal
and a reflected ray of light.

A

Angle of reflection

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4
Q

The effect of all the diamond’s internal
and external reflections of white light.

A

Brightness

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5
Q

Angle between the normal and the
maximum angle of refraction, which is the largest
angle at which rays inside the diamond can escape

A

Critical angle

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6
Q

An optical property that’s the difference
between the RI values of specific violet and red
wavelengths of visible light for a given material.

A

Dispersion

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7
Q

The flashes of color you see in a polished
diamond

A

Fire

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8
Q

The appearance of a material’s surface in
reflected light.

A

Luster

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9
Q

An imaginary line perpendicular to the point
where a ray of light strikes the surface.

A

Normal

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10
Q

The relative size, arrangement, and contrast
of bright and dark areas that result from a diamond’s
internal and external reflections.

A

Pattern

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11
Q

The overall condition of the facet surfaces of
a finished diamond.

A

Polish

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12
Q

The angles and relative measurements
of a polished gem and the relationships between
them

A

Proportions

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13
Q

The bouncing back of light when it
strikes a surface.

A

Reflection

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14
Q

Change in speed and possible change in
direction of light as it travels from one material to
another.

A

Refraction

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15
Q

A measure of the change in
the speed and angle of light as it passes from one
material to another.

A

Refractive index (RI)

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16
Q

The flashes of light and the contrasting
dark areas you see when the diamond, the light, or
the observer moves.

A

Scintillation

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17
Q

The exactness of a finished gem’s shape
and the placement of its facets

A

Symmetry

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18
Q

The passage of light into or through a
material.

A

Transmission

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19
Q

The distance between two adjacent
high points of an energy wave.

A

Wavelength

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20
Q

A fashioned diamond’s optical display is meant to be seen
face-up and in motion

A

Key concept

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21
Q

A skilled cutter’s faceting and proportion choices unlock a
diamond’s unique optical potential

A

Key Concept

22
Q

Light is a form of radiant energy that travels in waves.

A

Key Concept

23
Q

Visible light is a small portion of the electromagnetic
spectrum.

A

Key Concept

24
Q

White light is a combination of all the spectral colors.

A

Key Concept

25
Q

The angle of incidence always equals the angle of reflection.

A

Key Concept

26
Q

A material’s optical density affects the speed of the light
that passes through it.

A

Key Concept

27
Q

Light rays that enter at the maximum angle of refraction
form a critical angle cone inside the diamond.

A

Key Concept

28
Q

The higher a gem’s RI, the smaller its critical angle

A

Key Concept

29
Q

White light breaks up into its component colors when it
passes at an angle into a denser material.

A

Key Concept

30
Q

Each spectral color has its own RI and angle of refraction.

A

Key Concept

31
Q

All diamonds have the same dispersion value, but differences
in diamond cut bring out differing amounts of fire.

A

Key Concept

32
Q

A diamond’s face-up pattern reveals almost all of the cutter’s
fashioning choices.

A

Key Concept

33
Q

GIA diamond cut grades apply to standard round brilliants in
all clarities across the D-to-Z color range.

A

Key Concept

34
Q

Variations in lighting and surroundings can affect a diamond’s
appearance.

A

Key Concept

35
Q

Diffused fluorescent lighting helps you evaluate a diamond’s
brightness and pattern, while spotlighting helps you evaluate
its fire.

A

Key Concept

36
Q

Variations in lighting and surroundings can affect a diamond’s

A

appearance

37
Q

The higher the optical density of a material, the

A

more it slows light down.

38
Q

The combined effect of all the diamond’s surface and internal white light reflections is its

A

brightness.

39
Q

Grease on the pavilion of a diamond results in

A

more light leakage through the pavilion.

40
Q

The angle of incidence always equals the

A

angle of reflection.

41
Q

White light is actually

A

a combination of all the spectral colors.

42
Q

The change in speed and possible change in direction of light as it travels from one material to another is called

A

retest

43
Q

The change in speed and possible change in direction of light as it travels from one material to another is called

A

refraction.

44
Q

The appearance of a material’s surface in reflected light is called

A

luster.

45
Q

The relative size, arrangement, and contrast of bright and dark areas that result from a diamond’s internal and external reflections is called

A

pattern.

46
Q

The difference between the RI values of specific violet and red wavelengths of visible light for a given material is its

A

dispersion.

47
Q

In order to exit a diamond, light must strike an inner surface

A

inside the critical angle.

48
Q

The flashes of light and the contrasting dark areas you see when the diamond, the light, or the observer moves are called

A

scintillation.

49
Q

Visible light is

A

a form of radiant energy.

50
Q

The passage of light into or through a material is called

A

transmission.

51
Q

The flashes of color you see in a polished diamond are called

A

fire.

Diamonds & Diamond Grading (20 decks)

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