Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Colored Stones Exam > GIA Colored Stones Exam 501-550 > Flashcards

GIA Colored Stones Exam 501-550 Flashcards

1
Q

A synthetic crystal growth method in which the chemical mixture is melted; then recrystalized.

A

melt process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

A synthetic crystal growth method that uses cooling pipes around an interior of melted chemical ingredients.

A

skull melt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

A growth method in which the synthetic crystal grows from a dissolved chemical mixture; sometimes at high temperatures an pressure.

A

solution process

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A synthetic growth method that starts WITHOUT a seed crystal.

A

spontaneous nucleation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Most synthetic gems are produced by either what two processes?

A

melt; solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A mass of tiny; randomly oriented crystals.

A

aggregate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A smooth; flat break in a gemstone parallel to planes of atomic weakness; caused by weak or few bonds between atoms; or both.

A

cleavage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A curved and ridged fracture in a gemsotne; extending from the surface inward.

A

conchoidal fracture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

An aggregate made up of individual crystals detectable only under very high magnification.

A

cryptocrystalline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How heavy an object is in relation to its size.

A

density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

A gemstones ability to withstand wear; heat and chemicals.

A

durability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Any break in a gem other than cleavage or parting.

A

fracture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The characteristic external crystal shape or form of a mineral.

A

habit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How well a gemstone resists scratches. Usually expressed in terms of the Mohs scale; with diamond the harderst (10) and talc the softest (1).

A

hardness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

An aggregate made up of individual crystals visable under magnification.

A

microcrystalline

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

A flat break in a gemstone caused by concentrated included minerals parallel to a twinning plane.

A

parting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

How well a gemstone resists light; heat; and chemicals is called ___________ .

A

stability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Ratio of the weight of a matrial to the weight of an equal volume of water.

A

specific gravity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Damage caused by sudden; extreme temperature changes.

A

thermal shock

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

A hollow cavity in a gem; filled with a liquid; a gas; and one or more crystals.

A

Three_phase inclusion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Atoms of a gem that aren’t part of its essential chemical composition.

A

trace element

22
Q

Change in a gem’s crystal direction during or after growth.

A

twinning

23
Q

Location of a change in crystal growth direction.

A

twinning plane

24
Q

A hollow cavity in a gem; usually filled with a liquid AND a gas.

A

Two_phase inclusion

25
Q

The smallest group of atoms with both the characteristic chemical composition and crystal structure of a mineral.

A

unit cell

26
Q

A unit cell defines a mineral’s ___________ .

A

basic identity

27
Q

If a crystal grows in a flux that is highly saturated with the necessary elements it tends to be ___________ .

A

small

28
Q

What aggregate’s crystals are visible only with magnification greater than a standard gemological microscope?

A

cryptocrystalline

29
Q

Which is classified in the orthorhobic system? A. Beryl B. Topaz C. Garnet D. Corundum

A

B. Topaz

30
Q

Which element causes the red in ruby and the green in emerald?

A

chromium

31
Q

What type of twinning is caused by enviromental change after the gem forms?

A

polysynthetic

32
Q

What type of twinning looks as if two crystal halves are mirror images?

A

contact

33
Q

Needles of actinolite found in emerald are classified as what?

A

inclusions

34
Q

A two_phase inclusion is a cavity in a gem that’s typically filled with a ___________ and a __________ .

A

liquid and gas

35
Q

Atoms in a gem that are not part of its essential chemical composition are called what?

A

trace elements

36
Q

The trace elements that cause corundum’s blue are ____________ and ________ .

A

iron and titanium

37
Q

An object’s weight in relation to its size is called its ____________ .

A

density

38
Q

Which gems are cryptocrystalline? A. opal and amethyst B. nephrite and jadeite C. chalcedony and turquoise

A

C. chalcedony and turquoise

39
Q

Rough spinel often occurs as what type of crystals?

A

twinned

40
Q

Many fashioned rubies have shallow proportions because they’re cut from what type of crystals?

A

flat

41
Q

What are the three different ways a gem can break?

A

cleavage and parting and fracture

42
Q

A gem’s price divided by its carat weight is called ___________ .

A

per_carat price

43
Q

The international unit of measurement for gem weight is the _________ .

A

metric carat

44
Q

Individual stone prices are referred to as __________ .

A

unit prices

45
Q

How many points are in a metric carat?

A

100

46
Q

A metric carat equals __________ gram(s).

A

0.20 gram

47
Q

How are most colored stones sold?

A

by weight

48
Q

What category of colored stone is often sold per piece?

A

small; inexpensive

49
Q

Sieves are most useful for sorting round gems with diameters that are what size?

A

3mm and below

50
Q

When you first start to count a large pile of small gems; it’s best to seperate them into groups of how many?

A

5

Colored Stones Exam (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions