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Colored Stones Exam > GIA Colored Stones Exam 201-250 > Flashcards

GIA Colored Stones Exam 201-250 Flashcards

(50 cards)

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1
Q

An opal with a dark background that is tranparent to semi_transparent and is valued for its strong play_of_color is known as _______ .

A

Black crystal opal

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2
Q

What gemstone carries thousands of years of cultural significance; especially in Asia?

A

Jade

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3
Q

Which is more valuable jadeite or nephrite?

A

Jadeite

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4
Q

What are jadeites three most important qualities?

A

color; transparency; texture

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5
Q

In addition to green what eight other colors can jadeite be?

A

lavender; red; orange; yellow; black; white; brown; gray

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6
Q

What is the trade term for the most valuable jadeite?

A

Imperial

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7
Q

What transparency is the most highly valued jadeite?

A

Semitransparent

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8
Q

Intense green.

A

Finest Jadeite

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9
Q

What country is the main polishing center for jadeite?

A

China

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10
Q

True or False: The intense global demand for jadeite exceeds production?

A

TRUE

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11
Q

Why are jadeite and nephrite both called jade?

A

The chemical differences are so subtle.

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12
Q

A readily available; lower_priced alternative to jadeite is ______ .

A

Nephrite

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13
Q

Gemstone jewelry that is carved from a single piece of rough is called a ________ .

A

holoith

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14
Q

In jade what is “mottling”?

A

An uneven distribution of color against a contrasting background

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15
Q

What is mountain jade?

A

Thick_skinned jadeite boulders

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16
Q

The coarsest texture category of jadeite is known as the term __________ .

A

new mine

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17
Q

The finest texture category of jadeite is known as the term _______ .

A

old mine

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18
Q

The term “relatively old mine” refers to what rexture category of jadeite?

A

medium

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19
Q

Weathered thin_skinned jadeite boulders are known as __________ .

A

river jade

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20
Q

Spots of color near the surface of a jadeite boulder; where the skin is thin enough to allow color to show through.

A

show points

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21
Q

What is type A jadeite?

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A

natural jadeite enhanced only with a surface coating of wax.

22
Q

Natural jadeite that’s bleached in acid to remove undesirable staining; then impregnated with wax or polymers is called __________ .

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A

type C jadeite

23
Q

In what area was jadeite first fashioned and used as an ornamental object?

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A

Central America

24
Q

The finest quality jadeite is called __________ .

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A

Imperial jadeite

25
Jadeite's finest green color is caused by _______ .
Chromium
26
The most valuable level of transparency in jadeite is __________ .
semitranpsrent
27
The toughness of jadeite is _________ .
exceptional
28
The finest texture category of jadeite is known as _______ .
old mine
29
What type is bleached and impregnated jadeite?
Type B
30
What type is dyed jadeite?
Type C
31
In Myanmar; the center of the jadeite mining district is ____________ .
Hpakan
32
Spots of color near the surface of a jadeite boulder; where the skin is thin enough to see through; are called ____________ .
show points
33
What country recently emerged as a valuable source of black jadite?
Guatemala
34
Polar jade is fine quality __________.
nephrite
35
What color is caused by the heat treatment of jadeite?
orange
36
Spinach jade is used to describe a color of ____________ .
nephrite
37
What country is a major source of nephrite?
New Zeland
38
What gemstone commands the highest per_carat price of all colored stones?
ruby
39
Where does ruby rate on the Mohs hardness scale?
9
40
Red to slightly purplish red; med to med-dark tone; vivid saturation
Finest ruby
41
What trace element causes ruby to be red?
Chromium
42
What causes fluorescence in a ruby?
Chromium
43
In what type of deposits are the finest rubies found?
marble deposits
44
Basalt_hosted rubies have higher levels of what element?
iron
45
The iron in basalt_hosted rubies inhibit what?
fuorescence
46
What is used to treat almost all rubies?
heat
47
What country IMPORTS the most rubies than any other?
USA
48
What country is the world's largest marketing center?
Thailand
49
What country EXPORTS the most of the faceted commercial_ quality rubies?
Thailand
50
Switzerland deals with what type of rubies from other countries?
high_end

Colored Stones Exam (15 decks)

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