Quiz: Gems

Why do rare gems cost

a great amount of money?

• They are rare.

• Mining them is often

  done by hand.

• They are only found

  deep within the earth.

• All of the above.

Where are most crystals formed?

• on the slopes of volcanoes

• deep within the earth

• in rivers in Africa

• all of the above

How are crystals and organic

gems different?

• Crystals are minerals, and

  organic gems come from

  living things.

• Crystals are found near the

  surface of the earth, and

  organic gems come from

  deep within the earth.

• Crystals are skeletons of tiny

  sea creatures, and organic

  gems are mixed minerals

  with strict shapes.

• Crystals are used in jewelry,

  and organic gems are used

  on tools.

What are atoms?

• types of gems created

  from crystals

• very small particles that make

  up all things on Earth

• certain types of gems found

  only in South America

• types of sea creatures that

  form coral reefs

Why is it important for a gem

in a ring to be high on the

Mohs scale?

• so it will have a purer color

• so it will not have any streaks

  or grain

• so it will not be damaged

  during wear

• so it will be closer to

  a diamond on the scale

How is a gem valued?

• by where it was mined

• by how many facets

  it contains

• by how hard it was

  to locate and mine

• by its cut, carat, color,

  and clarity

What is not true about natural

pearls?

• They can take years to form.

• They are perfectly round.

• They are an organic

  gemstone.

• They form inside oysters

  from a grain of sand.

Which of the following states

an opinion?

• The most valuable quartz

  is a stone called opal.

• Blue-green turquoise often

  has pretty spots and streaks

  running through it.

• Gem-quality emeralds

  are rare and usually small.

• Quartz is found all over

  the world, in all colors

  of the rainbow.

What type of gem is formed

when a mineral is squeezed

under layers of rock?

• diamond

• emerald

• pearl

• opal

Which of the following

is not a crystal?

• a diamond

• a pearl

• a sapphire

• an opal