Cut and Value

Question 1

The pavilion angle is formed by the girdle plane and what else?

Answer 1

Pavilion main facets

Question 2

What does a diamond’s finish consist of?

Answer 2

Symmetry and polish

Question 3

What is the primary purpose of the culet?

Answer 3

Prevent chipping

Question 4

What is the sparkle that occurs in a diamond when the gem, its light source, or its observer moves?

Answer 4

Scintillation

Question 5

What is the balance of a finished gem’s facet known as?

Answer 5

Symmetry

Question 6

On fancy shapes such as the oval or pear, what might variations in the pavilion angle cause?

Answer 6

Bow-Ties

Question 7

What are the sides near the points of marquises, pears, and hearts called?

Answer 7

Wings

Question 8

What is the separation of white light into its spectral colors?

Answer 8

Dispersion

Question 9

What is the quality of the polish and prevision of the cut of a fashioned gemstone?

Answer 9

Finish

Question 10

What is present in diamonds when an unattractive gray ring under the table?

Answer 10

Shallow pavilions

Question 11

What do symmetry variations include?

Answer 11

Off-center tables and misshapen facets

Question 12

What two things form the crown angle?

Answer 12

The girdle plane and bezel facets

Question 13

The pavilion depth percentage is expressed as a percentage of what?

Answer 13

Average girdle diameter

Question 14

If a marquise cut measures 9mm x3mm, what is it’s length-to-width ratio?

Answer 14

3:1

Question 15

What do the angles and relative measurements of a polished gem and the relationships between them describe?

Answer 15

Proportions

Question 16

What are the eight basic proportions of a diamond?

Answer 16

Girdle Outline, Table Size (Table Percentage), Crown Angle, Girdle Thickness, Pavilion Depth Percentage (Pavilion Angle), Total Depth Percentage, Culet Size, Length-to-Width Ratio (Fancy Shapes)

Question 17

Where are the Star Facets located?

Answer 17

The first ring of facets around the table, directly touching the Table and the Bezel Facets.

Question 18

Where are the Bezel Facets located?

Answer 18

The second ring of facets, touching the Star Facets and the Upper Half Facet.

Question 19

Where are the Upper Half Facets located?

Answer 19

The third ring of facets, edges touching the Bezel Facets and the Girdle.

Question 20

Where are the Lower Half Facets located?

Answer 20

The facets around the pavilion that connect from the Girdle to the Pavilion Main Facets.

Question 21

Where are the Pavilion Main Facets located?

Answer 21

The facets around the pavilion that meet at the Culet and points up to the Girdle.

Question 22

In most round brilliant table sizes, what is the range that reflects a compromise between weight retention and optical beauty?

Answer 22

Between 50% and 66%

Question 23

What do most diamonds have crown angles between?

Answer 23

25 and 35

Question 24

Bruted Girdle

Answer 24

An unpolished girdle on a diamond that should look frosted or waxy.

Question 25

What is the Fisheye effect?

Answer 25

When the pavilions are shallower than 38%, and the girdle reflection forms an unattractive gray ring under the table.

Question 26

When do stones look dark in the center?

Answer 26

When the pavilions are deeper than 49%.

Question 27

What is a Nailhead effect?

Answer 27

When the pavilion depth is 50% or more and a dark area under the table is produced.

Question 28

What are the most popular length-to-width ratios for Marquises?

Answer 28

Between1.75:1 and 2.25:1

Question 29

What are the most popular length-to-width ratios for Ovals?

Answer 29

Between 1.33:1 and 1.66:1

Question 30

What are the most popular length-to-width ratios for Emerald cuts, Rectangular Cushions, and Pears?

Answer 30

Between 1.50:1 and 1.75:1

Question 31

What is the most popular length-to-width ratio for Hearts?

Answer 31

1:1

Question 32

For round brilliants, most table percentages are:

Answer 32

50% and 60%

Question 33

For round brilliants, most crown angles are:

Answer 33

25 and 35

Question 34

For round brilliants, most pavilion depths are:

Answer 34

Between 42% and 44%

Question 34

Total depth percentage is a combination of what three things?

Answer 34

Crown Height Percentage, Girdle Thickness Percentage, and Pavilion Depth Percentage

Question 34

What aspect of a diamonds cut do most fancy cuts have, but most rounds don't?

Answer 34

The culet

Question 34

What are the eight primary factors that enter into an evaluation of a diamond's polish?

Answer 34

Abrasions, lizard skin, nicks, pits, polish lines, burn marks, rough girdle, scratches

Question 35

What are the eight symmetry variations?

Answer 35

Table or culet off-center, girdle outline out-of-round, facets that fail to point properly, misaligned crown and pavilion facets, table not a regular octagon, misshapen facets, extra facets, uneven outline

Question 37

Average Girdle Diameter

Answer 37

The result achieved by adding the smallest and largest girdle measurements of a round brilliant and dividing by two.

Question 38

Craftsmanship

Answer 38

The care that goes into the fashioning of a polished diamond, as confirmed by its finish.

Question 39

Crown Angle

Answer 39

The angle formed by the bezel facets and the girdle plane.

Question 40

Design

Answer 40

A diamond's physical shape, including its proportions and durability, determined by decisions made during the fashioning process.

Question 41

Dispersion

Answer 41

The separation of white light into spectral colors.

Question 42

Finish

Answer 42

The quality of the polish and precision of the cut of a fashioned gemstone.

Question 43

Girdle Outline

Answer 43

Face-up shape of a polished gem.

Question 44

Length-to-Width Ratio

Answer 44

The comparison of the length to the width of a fancy-shaped diamond.

Question 45

Make

Answer 45

The qualities of a faceted diamond's proportions and finish.

Question 46

Pavilion Angle

Answer 46

The angle formed by the pavilion main facets and the girdle plane.

Question 47

Pavilion Bulge

Answer 47

larger-than-usual pavilion angles on the middle tier of facets, designed to add weight to a step-cut stone.

Question 48

Pavilion Depth Percentage

Answer 48

The distance from the bottom of the girdle plane to the culet, expressed as a percentage of the average girdle diameter.

Question 49

Polish

Answer 49

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

Question 50

Proportions

Answer 50

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

Question 51

Refraction

Answer 51

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

Question 52

Refractive Index (RI)

Answer 52

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

Question 53

Shoulder

Answer 53

One of the two sides adjacent to the rounded end of a pear or oval shape.

Question 54

Symmetry

Answer 54

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

Question 55

Table Percentage (Size)

Answer 55

Table size expressed as a percentage of a round brilliant's average girdle diameter.

Question 56

Total Depth Percentage

Answer 56

Table-to-culet depth, expressed as a percentage of average girdle diameter.

Question 57

Wing

Answer 57

One of the two sides near the point of a marquise, pear, or heart shape.