Diamonds And Diamond Grading

Front 1

As a diamonds Pavilion gets deeper it's table reflection becomes

Back 1

Larger

Front 2

If a diamonds culet is too large it will look like

Back 2

A black spot under the table

Front 3

Which of the following Pavilion depth percentages would most likely cause a girdle reflection to be visible face up through the table

Back 3

37.0 %

Front 4

The care that goes into the fashioning of a polished Diamond as confirmed by its finish is its

Back 4

Craftsmanship

Front 5

Lower half facet length is expressed as a percentage of the

Back 5

Girdle-to-culet distance

Front 6

The purpose of the culet facet is to

Back 6

Prevent chipping

Front 7

The proportions that play the biggest role in determining a round brilliant diamonds brightness are table percentage, Crown angle, and

Back 7

Pavilion angle

Front 8

Culet size should be considered when determining

Back 8

Pavillion depth percentage

Front 9

Which of the following is part of the evaluation of symmetry

Back 9

Natural

Front 10

A diamond with variations in alignment probably also has

Back 10

Misshapen facets

Front 11

A diamond with a thick girdle, steep Crown or deep pavilion represents poor value because

Back 11

It appears smaller face up than its weight suggest

Front 12

A diamonds physical shape including its proportions and durability determined by decisions made during the fashioning process is its

Back 12

Design

Front 13

Most diamonds have some symmetry variation

Back 13

But they rarely effect appearance

Front 14

The more inclusion differs in color from its host diamond

Back 14

The more obvious it is

Front 15

A feather that reaches the bezel surface as well as the surface in the pavillion main directly under the bezel

Back 15

Should be plotted on both the crown and Pavilion diagrams

Front 16

Blemish dont usually affect the clarity grade in diamonds below

Back 16

IF

Front 17

The stone with this Clarity characteristics which would be the grade setting characteristic

Back 17

Feather

Front 18

Which of these would disqualify a Stone from being graded IF

Back 18

Pinpoint

Front 19

On a plot drawing a characteristic only in green indicates that it's

Back 19

A blemish

Front 20

Diamonds with minute inclusions that range from extremely difficult to very difficult to see under 10x are classified

Back 20

VVS1 OR VVS2

Front 21

Inclusions or blemishes that established the clarity grade of a diamond are collectively called

Back 21

Grade setting characteristics

Front 22

In most cases the easier it is to see a Clarity characteristics , the...

Back 22

Lower the clarity grade

Front 23

Does designation S I means

Back 23

Slightly included

Front 24

A round brilliant cut VVS Diamond could have

Back 24

A small pinpoint under a lower half facet

Front 25

VS1 and vs2 Stones might have

Back 25

Minor included crystals and feathers

Front 26

One factor used to determine the clarity grade of a diamond is a inclusions

Back 26

Location

Front 27

A Stone with only a few extra facets on its Pavilion that can't be seen face up should be graded

Back 27

Flawless

Front 28

Inclusions are usually most visible when they're located

Back 28

Directly under the table

Front 29

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

Back 29

Are more rare

Front 30

Trade terms that describe Diamond color

Back 30

Can be misleading

Front 31

Diamonds used as stones for color grading in the normal color range are called

Back 31

Master stones

Front 32

The most widely accepted lighting for color grading diamonds is

Back 32

Balanced, daylight-equivalent fluorescent light

Front 33

Subtle color differences are usually more visible when seen

Back 33

Through the pavillion

Front 34

A master Stone graded as a whole grade represents the

Back 34

Least amount of color possible in that grades range

Front 35

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

Back 35

H

Front 36

Which of the following makes a diamond unsuitable for master Stone set

Back 36

Fluorescence

Front 37

When color grading with Master stones you should

Back 37

Move the unknown to compare it on both sides of the master stones

Front 38

A loose Brown Diamond should be color graded

Back 38

As a range of colors

Front 39

If a diamond has a slight tint in the face down position and appears colorless in the face up position its estimated color should be

Back 39

G,H, I, J

Front 40

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

Back 40

Characteristic color

Front 41

Diamonds outside normal color range are graded

Back 41

Face up

Front 42

The GI laboratory uses a Z master Stone to determine fancy

Back 42

Yellows

Front 43

A diamond grading system provides

Back 43

A consistent way to communicate Diamond quality

Front 44

A wholesaler is someone who

Back 44

Sell to retailers

Front 45

Diamond prices on wholesale price list

Back 45

Graded much more thoroughly than small low-quality ones

Front 46

Diamonds Supreme hardness and durability are

Back 46

A result of the conditions under which its formed

Front 47

Once Diamond deposits are located mining companies

Back 47

Must spend additional time and money to evaluate and develop them

Front 48

An estimation of the value of the article is a

Back 48

Appraisal

Front 49

The most consistent and dependable sources of diamond grades are

Back 49

Reputable gemological laboratories

Front 50

Substantial price discounts are available to retailers and jewelry manufacturers who

Back 50

Can buy in large quantities

Front 51

Diamond clarity and color grades indicates it's

Back 51

Quality

Front 52

Reputable gemological laboratories don't grade mounted diamonds

Back 52

Because mountings hide details of clarity and cut

Front 53

Dealers often sort melee by size using

Back 53

Sieves

Front 54

The diamond industry has changed dramatically in recent years because

Back 54

The world's supply of diamond rough has increased

Front 55

The argyle mine in Australia contributed to

Back 55

The rise of the cutting industry in india

Front 56

Wholesale price lists are usually organized according to

Back 56

Specific combinations of the four cs

Front 57

Trigons are

Back 57

Growth marks

Front 58

Inclusions are easier to see using

Back 58

Dark field illumination

Front 59

Included diamond crystal that expense the surface of a fashioned diamond is called a

Back 59

Knot

Front 60

A paper worn diamond is one that

Back 60

Abrasions

Front 61

A indention with tiny root like feathers penetrating the stone is called a

Back 61

Bruise

Front 62

Which of the following is classified as a inclusion

Back 62

Chip

Front 63

Example of a blemish is a

Back 63

Natural

Front 64

A solid mineral body enlosed within a diamond or other gem is

Back 64

An included crystal

Front 65

The inclusion called bearding consists of tiny

Back 65

Feathers

Front 66

A portion of the roughs original surface or skin that dips below the Polish diamonds surface is called a

Back 66

Indented natural

Front 67

A term used to describe any break within a diamond is

Back 67

Feather

Front 68

A Clarity characteristics of onto the surface of a polished gemstone is called a

Back 68

Blemish

Front 69

A loupe usedfor clarity grading must be corrected for a chromatic and

Back 69

Spherical distortion

Front 70

With dark field illumination light is directed into the Stone from

Back 70

The side

Front 71

Which of the following is not a diamond inclusion

Back 71

Gas bubble

Front 72

Squares or rectangles, trigons and parallel grooves are types of

Back 72

Growth marks

Front 73

The crystal planes most suitable for cleaving a Diamond are the

Back 73

Octahedral planes

Front 74

Which is the softest Crystal Direction in Diamond

Back 74

Dodecahedral

Front 75

Crystal shape is an important factor in the evaluation of rough because

Back 75

It affects the amount of weight retained after cutting

Front 76

The diamond term glassie refers to

Back 76

A well formed octahedral crystal

Front 77

A naturally occurring inorganic substance with a characteristic chemical composition and usually a characteristic crystal structure is known as a

Back 77

Mineral

Front 78

The habit of gem quality diamond is the

Back 78

Octahedron

Front 79

Another name for the cubic Crystal system is

Back 79

Isometric

Front 80

And diamonds cleavage is caused by

Back 80

Relatively wide spaces between some Atomic planes

Front 81

A flat triangular twinned diamond crystal is called a

Back 81

Macle

Front 82

The strongest of all Atomic bonds are called

Back 82

Covalent

Front 83

Solid matter with atoms arranged in a regular repeating pattern is called a

Back 83

Crystal

Front 84

The smallest group of atoms with a characteristic chemical composition and the basic crystal structure of a mineral is called a

Back 84

Unit cell

Front 85

What is the specific gravity of gem-quality diamond

Back 85

3.52

Front 86

Atoms in a gem that aren't part of his essential chemical composition are called

Back 86

Trace elements

Front 87

A round brilliant diamonds table size is expressed as

Back 87

A percentage of its average girdle diameter

Front 88

If a diamonds total but that percentage is 51.0% its cut grade will be

Back 88

Fair or poor

Front 89

A transparent measuring device divided into millimeters and tenths of a millimeter used to measure a diamonds table is called a

Back 89

Table gauge

Front 90

Advantage of the face of method of crown angle estimation is that it

Back 90

Can be used with mounted diamonds

Front 91

What is the crown high percentage of a diamond with a crown angle of 32 degrees and 60% table

Back 91

12.5%

Front 92

Extremely thick girdle

Back 92

Adds weight without contributing to the stone appearance

Front 93

Most round brilliants have tables percentages that range from about

Back 93

55 to 65 percent

Front 94

The counting of the angle formed by the girdle plan and the

Back 94

Bezel facets

Front 95

On a well-made diamond the girdle will

Back 95

Have just enough thickness to prevent chipping

Front 96

A weight retention method that adjusts the angles of some facets to allow proportions of a diamond girdle to be thicker is called

Back 96

Painting

Front 97

When using the Bowing method fastest that reach one third of the way toward the girdle make the lines appear

Back 97

To bow out

Front 98

When using the ratio method for estimating table percentage a 1 1/4 ratio indicates a table of approximately

Back 98

60 percent

Front 99

The relative size, arrangement and contrast of bright and dark areas that result from a diamonds internal and external Reflections is called

Back 99

Pattern

Front 100

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

Back 100

Fire

Front 101

Variations in lighting and surroundings can affect a diamonds

Back 101

Appearance

Front 102

Visible light is

Back 102

A form of radiant energy

Front 103

Diamonds RI is

Back 103

2.417

Front 104

White light is actually

Back 104

A combination of all the spectral colors

Front 105

The passage of light into a through a material is called

Back 105

Transmission

Front 106

The higher the optical density of a material, the

Back 106

More it slows down

Front 107

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

Back 107

Refraction

Front 108

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

Back 108

Inside the critical angle

Front 109

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

Back 109

Scintillation

Hint 109

Pattern and sparkle

Front 110

The appearance of material surface in reflected light is called

Back 110

Luster

Front 111

Grease on the Pavilion of a diamond results in

Back 111

More light leakage through the pavillion

Front 112

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

Back 112

Dispersion

Front 113

The angle of incidence always equals the

Back 113

Angle of reflection

Front 114

The combined effect of all the diamonds surface and internal whitelight reflection is it

Back 114

Brightness