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Gemmology > Chapter 11 Colored Diamonds Color > Flashcards

Chapter 11 Colored Diamonds Color Flashcards

1
Q

What is the GIA Colored Diamond Grading System based on?

A

It evolved from the D-to-Z system

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2
Q

What do graders use to mark boundaries between color designations?

A

Reference stones

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3
Q

How do graders compare colored diamonds?

A

Side by side in a controlled lighting and viewing environment

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4
Q

True or False: Colored diamonds are simpler to grade than diamonds in the normal color range.

A

False

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5
Q

What has GIA established for grading colored diamonds?

A

A system for color grading these exceptional stones

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6
Q

What is a key reason for knowing how graders in the lab grade colored diamonds?

A

To appreciate the process and discuss it with clients

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7
Q

Fill in the blank: The GIA Colored Diamond Grading System applies special terms to _______.

A

[color ranges]

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8
Q

What does the GIA Colored Diamond Grading System describe?

A

Color objectively using clearly defined color references

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9
Q

Why is the GIA Colored Diamond Grading System considered less subjective?

A

It uses clearly defined color references

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10
Q

What is a potential drawback of using a descriptive approach for color identification?

A

It makes identification more personal or cultural

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11
Q

What terms might a descriptive approach use for color identification?

A
  • Lemon yellow
  • Harvest gold
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12
Q

What challenge does a descriptive approach present in terms of application?

A

Makes universal application of the system almost impossible

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13
Q

Why is color designation important in the context of colored diamonds?

A

It can be worth a lot of money

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14
Q

What is necessary for a color designation to be effective globally?

A

It needs to be understood and accepted throughout the world

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15
Q

What does each of the 27 basic hue terms represent?

A

A range of color within the hue circle

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16
Q

When a description consists of more than one color, where is the predominant color stated?

A

Last

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17
Q

Do different hues reach their highest saturation at different tones?

A

Yes

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18
Q

Fill in the blank: The hue term for the color that is a mix of red and orange is _______.

A

ORANGY RED

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19
Q

What is the hue term for a color described as reddish orange?

A

REDDISH ORANGE

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20
Q

What is the hue term for orange mixed with yellow?

A

YELLOWISH ORANGE

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21
Q

Fill in the blank: The hue term for a color that is a combination of yellow and orange is _______.

A

YELLOWORANGE

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22
Q

What is the hue term for a color that is predominantly yellow and has a greenish tint?

A

YELLOW GREEN

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23
Q

What hue term describes a color that is greenish yellow?

A

GREENYELLOW

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24
Q

What is the hue term for a color that is a mix of green and yellow?

A

YELLOWISH GREEN

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25
Q

Fill in the blank: The hue term for a color that is predominantly green with a bluish tint is _______.

A

BLUISH GREEN

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26
Q

What hue term describes a color that is a mix of blue and green?

A

BLUEGREEN

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27
Q

What is the hue term for a color that is predominantly blue with a violet tint?

A

VIOLETISH BLUE

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28
Q

What hue term describes a color that is bluish violet?

A

BLUISH VIOLET

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29
Q

Fill in the blank: The hue term for a color that is a mix of red and violet is _______.

A

PURPLERED

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30
Q

What is the hue term for a color that is predominantly purple?

31
Q

What hue term describes a color that is reddish purple?

A

REDDISH PURPLE

32
Q

How many hues does GIA recognize for color grading diamonds?

A

27 hues

This is a practical limit on color descriptions in diamond grading.

33
Q

What is the purpose of the hue circle in GIA’s grading system?

A

It serves as the first point of reference for all GIA graders when preparing a colored diamond grading report.

The hue circle clearly illustrates the boundaries of each color range.

34
Q

What types of colors are included in the 27 hues recognized by GIA?

A

Basic colors and mixed colors

Examples include red, blue, green, orangy red, green-blue, and greenish yellow.

35
Q

In the GIA system, where is the predominant hue stated?

A

Last

This affects terms like ‘yellow-green’ and ‘green-yellow’, which represent different hues.

36
Q

True or False: The term ‘pink’ in the GIA system can replace ‘red’.

A

True

This occurs when reddish orange to reddish purple hues are pale.

37
Q

Fill in the blank: The GIA color grading system creates terminology that is precise enough for the lab but _______ enough for the marketplace.

A

accessible

This balance is essential for effective communication in diamond grading.

38
Q

What determines the highest saturation of different hues in the GIA system?

A

Different tones

Each hue reaches its highest saturation at varying tones.

39
Q

What grade term describes a diamond’s hue with low tone and saturation?

A

Faint

Faint indicates the least intensity in hue.

40
Q

What is the grade term for a diamond that is very light in hue?

A

Very Light

Very Light indicates a slight presence of color.

41
Q

Which grade term indicates a diamond with a combination of medium tone and saturation?

A

Fancy

Fancy is a standard term for colored diamonds.

42
Q

What grade term corresponds to a diamond with high saturation and deep tone?

A

Fancy Deep

Fancy Deep denotes a rich color presence.

43
Q

Fill in the blank: A diamond that is described as ‘Fancy Vivid’ has a __________ hue.

A

very high saturation and tone

Fancy Vivid is one of the highest grades for hue.

44
Q

What grade term is used for a diamond with a medium tone and high saturation?

A

Fancy Intense

Fancy Intense is a strong color grade.

45
Q

Which grade term indicates a diamond with a light tone and low saturation?

A

Light

Light describes a subtle color presence.

46
Q

What grade term indicates a diamond with a combination of light tone and high saturation?

A

Fancy Light

Fancy Light signifies a lighter color with richness.

47
Q

What is the grade term for a diamond that is dark in hue?

A

Fancy Dark

Fancy Dark indicates a deeper, richer color.

48
Q

What grade term indicates a diamond with a medium tone and vivid saturation?

A

Fancy Vivid

Fancy Vivid represents one of the most desirable color intensities.

49
Q

What term is used to describe the strength of a diamond’s hue?

A

Hue strength plays a significant role in determining colored diamond value.

50
Q

What happens to the value of a diamond as the strength of its hue increases?

A

The stronger the hue, the more valuable the diamond.

51
Q

How does the saturation of yellow diamonds compare to blue diamonds?

A

Yellow diamonds occur in a wide range of saturations while blue diamonds do not.

52
Q

What is the effect of color depth on grading boundaries for yellow and blue diamonds?

A

The boundaries for fancy grades in the yellow hue range allow for greater depths of color than they do in the blue hue range.

53
Q

What does color distribution refer to in diamond grading?

A

The evenness or unevenness of color seen face-up using standard viewing procedures.

54
Q

What terms are used to describe color distribution in diamond grading?

A

Color distribution is stated as ‘uneven’ or ‘even.’

55
Q

Which diamond grades use color distribution in their grading process?

A
  • Fancy
  • Fancy Intense
  • Fancy Dark
  • Fancy Deep
  • Fancy Vivid
56
Q

What is the first step graders take when grading a colored diamond?

A

Placing the stone to be graded face-up in a plastic tray inside a viewing box.

57
Q

What is the purpose of the viewing box in the grading process?

A

It provides a controlled, neutral environment.

58
Q

What role does the tray serve in the diamond grading process?

A

The tray serves as a stone holder.

59
Q

What are the obstacles to grading faceted colored diamonds?

A

They present a mosaic of colors depending on the viewing angle, angle of light source, cut of the diamond, and high refractive index of diamond.

60
Q

How does a grader find the best angle to see a diamond’s characteristic color?

A

The grader rocks the diamond slightly in the tray.

61
Q

What is the overall basic color of a diamond?

A

The color viewed in the face-up position, excluding surface reflections, fire, and dark or washed-out areas.

62
Q

How does a grader narrow the color range of an unknown diamond?

A

By systematically comparing it with each reference stone.

63
Q

What do colored diamond reference stones offer compared to masterstones?

A

They come in a greater variety of colors.

64
Q

What is typically sufficient for completing the color grading process of a diamond?

A

Colored diamond reference stones.

65
Q

What do graders use when colored diamond reference stones are unavailable?

A

Opaque color chips.

66
Q

True or False: The cut of the diamond does not affect its grading.

67
Q

Fill in the blank: The diamond’s characteristic color is evaluated in the _______ position.

68
Q

What is the main objective of grading a diamond’s color?

A

To arrive at repeatable results that are consistent between graders.

69
Q

What is used to determine the location of a diamond’s characteristic color?

A

The most comparable reference stones.

70
Q

What system is referenced for determining a diamond’s color?

A

The GIA system.

71
Q

True or False: Graders should describe the diamond using different terminology.

72
Q

Fill in the blank: The grader assigns the terminology that corresponds to the diamond’s _______.

A

[characteristic color].

73
Q

What should graders end up describing the diamond with?

A

The same words.

74
Q

What does the grader succeed in determining when the diamond is bracketed?

A

The location of the diamond’s characteristic color.

Gemmology (42 decks)

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