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Colored Stones Exam > GIA Colored Stones Exam 101-150 > Flashcards

GIA Colored Stones Exam 101-150 Flashcards

1
Q

Bluish_green to green.

A

Finest Emerald

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2
Q

What element increases the amount of blue in an emerald’s color?

A

Iron

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3
Q

The trade term “Zambian” describes emeralds with ________________ and ______________ than Columbian.

A

More bluish color and darker tone

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4
Q

What type source rock are Brazilian emeralds mined from?

A

Pegmatites; where they intersect with schists.

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5
Q

To emphasize the most desirable color; cutters orient a fashioned emerald with it’s table _____________ .

A

Perpendicular to the crystal length

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6
Q

What is the estimated percentage of fashioned emeralds that contain filled fractures?

A

90% or more

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7
Q

What to countries account for about 75% of emerald purchases worldwide?

A

US and Japan

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8
Q

Four major emerald sources are Columbia; Zambia; Brazil and _____________ .

A

Zimbabwe

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9
Q

One of Columbia’s traditional emerald mines is called ____________ .

A

Coscuez

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10
Q

Compared to emerald’s from other sources; emeralds from African mines generally contain ____________ .

A

Fewer fractures.

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11
Q

Emerald is a variety of what species?

A

Beryl

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12
Q

What coloring of the stone disqualifies it from being considered and emerald.

A

Too yellowish or too bluish

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13
Q

Name the two most common clarity characteristics in an emerald.

A

Fractures and liquid inclusions

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14
Q

What does the trade term “jardin” mean?

A

jardin _ French word for garden. A descriptive term for an emerald’s inclusions that look mossy or garden_like.

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15
Q

Natural emerald with colorless or colored filling.

A

Level 1 Treatment

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16
Q

Natural emerald having filling that is minor; moderate or significant.

A

Level 2 Treatment

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17
Q

Type of filler (upon request) if the laboratory is equipped.

A

Type 3

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18
Q

Does the GIA provide Level 3 emerald treatment identification?

A

No.

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19
Q

What is the name for an emerald in which it’s inclusions form a star_like pattern of rays.

A

Trapiche

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20
Q

What are the three signs that point to an “emerald” being a glass immitation?

A

Gas bubbles; Concave Surfaces; Rounded facet junctions

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21
Q

Reddish orange to orange red.

A

Imperial topaz

22
Q

The most valuable topaz varieties are _____________ .

A

Pink; Red

23
Q

Most gem_quality topaz comes from what growth source?

A

Pegmatites.

24
Q

The term precious topaz is used for ___________ .

A

Yellow to orange stones.

25
Q

What is the most common color of untreated; natural topaz?

A

Colorless.

26
Q

Wah Wah mountain area.

A

Imperial topaz source

27
Q

In order to obtain a treated pink color; yellow to reddish brown topaz must contain elemant

A

Chromium

28
Q

Medium dark blue to slightly greenish blue.

A

Finest Aquamarine

29
Q

Which method is used to produce synthetic aquamarine?

A

Hydrothermal

30
Q

The most important source country for aquamarine is ____________ .

A

Brazil

31
Q

Which recent source is the leading producer of small; commercial_quality aquamarine?

A

China

32
Q

Most aquamarine has it’s color improved by what treatment?

A

Heat

33
Q

What color is morganite beryl?

A

Pink

34
Q

What gemstone is the rarest beryl?

A

Red beryl

35
Q

What color is morganite beryl?

A

pink

36
Q

The only source of red beryl is located in what US state?

A

Utah

37
Q

What causes the wide variety of colors in topaz?

A

Color centers and chromium.

38
Q

Why does topaz require special care and handling?

A

Cleavage.

39
Q

What area in Brazil is the world’s major commercial source of imperial and red topaz.

A

Ouro Preto

40
Q

Which treatments are involved with topaz?

A

Heating and irradiation

41
Q

What are the two most important considerations for buyers of treated blue topaz?

A

Price and uniformity

42
Q

The finest most saturated color of aquamarine is normally shown in ____________ .

A

Large sizes.

43
Q

What three countries are the leading producers of aquamarine?

A

Brazil; Pakistan; China

44
Q

What trace element causes red beryls color?

A

Manganese

45
Q

What distinguishes green beryl from emerald?

A

Tone and saturation

46
Q

Because of topaz’s elongation; how are they cut?

A

long ovals; pears; emerald

47
Q

What is the trade term for a highly prized; vivid blue adularescence displayed for the finest moonstone?

A

Blue sheen

48
Q

Tiny tension cracks in moonstone that iterfere with adularescence and reduce value are called _______ .

A

Centipedes

49
Q

What is the trade term for an imitation of aventurine feldspar made of glass that contains copper crystals?

A

Goldstone

50
Q

Why does feldspar; spodumene and diopside have weak consumer recognition?

A

Because of unpredictable supplies

Colored Stones Exam (15 decks)

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