Assignment 2

Question 0

Crossing of chatoyant bands, creating a star in the dome of a cabochon

Answer 0

Asterism

Question 1

The cloudy bluish white light in the moonstone, caused by scattering of light

Answer 1

Adularescence

Question 2

A glittery effect caused by light reflecting from small, flat inclusions within a gemstone

Answer 2

Aventurescence

Question 3

A gemstone’s basic color, determined by its selective absorption of light

Answer 3

Bodycolor

Question 4

Bands of light in certain gems, caused by reflection of light from many parallel, needle- like inclusions or hollow tubes

Answer 4

Chatoyancy

Question 5

Small defect in the atomic structure of a material that can absorb light and give rise to a color

Answer 5

Color center

Question 6

A distinct change in gem color under different type of lighting

Answer 6

Color change

Question 7

The selection of color in which a gemstone occurs

Answer 7

Color range

Question 8

Areas of different color in a gem, caused by variations in growth conditions

Answer 8

Color zoning

Question 9

The separation of white light into spectral colors

Answer 9

Dispersion

Question 10

Dark areas in the faceted transparent colored stone

Answer 10

Extinction

Question 11

The color or colors in a gemstone’s color range considered by the trade to the most desirable

Answer 11

Fine color

Question 12

Emission of visible light by a material when it is simulated by ultraviolet radiation

Answer 12

Florescence

Question 13

The first impression of an object’s basic color

Answer 13

Hue

Question 14

A rainbow effect created when light is broken up into spectral hues by thin layers

Answer 14

Iridescence

Question 15

A broad flash of color in labradorite feldspar that disappears when the gem is moved

Answer 15

Labradorescence

Question 16

A two-toned effect seen when a chatoyant gem is positioned at right angles to a light source

Answer 16

Milk and honey

Question 17

Iridescence seen in some natural and cultured pearls and mother of pearl

Answer 17

Orient

Question 18

The flashing rainbow colors in Opal

Answer 18

Play of color

Question 19

When a gem shows different bodycolors from different directions

Answer 19

Pleochroism

Question 20

The color’s strength of intensity

Answer 20

Saturation

Question 21

Process by which a material absorbs some components of visible light and returns others

Answer 21

Selective absorption

Question 22

Degree of darkness or lightness of a color

Answer 22

Tone

Question 23

Terms often used in the jewelry industry to describe particular gemstone colors or link gems with specific geographic locations

Answer 23

Trade terms

Question 24

An area of weak saturation in a transparent gemstone’s bodycolor that usually results from the way the gem was cut

Answer 24

Window