CS 10

Question 1

1. In which of the following colored stone clarity grades do the definitions vary for each clarity type?
   A. Eye-clean
   B. Heavily included
   C. Severely included
   D. Moderately included

Answer 1

Moderately included

Question 2

1. The highest clarity grade for colored stones is
   A. flawless.
   B. eye-clean.
   C. internally flawless.
   D. very very slightly included.

Answer 2

eye clean

Question 3

1. Which of these gems is classified as Type III?
   A. Ruby
   B. Topaz
   C. Emerald
   D. Chrysoberyl

Answer 3

Emerald

Question 4

1. Fingerprints are
   A. pits.
   B. fractures.
   C. blemishes.
   D. partially healed fracture planes.

Answer 4

partially healed fracture planes.

Question 5

1. Two factors that determine an inclusion’s impact on a gem’s value are
   A. size and shape.
   B. position and relief.
   C. location and shape.
   D. crystal system and size.

Answer 5

position and relief.

Question 6

1. A general term for a break in a stone is
   A. chip.
   B. cavity.
   C. feather.
   D. fingerprint.

Answer 6

Feather

Question 7

1. Inclusions are important to gemologists because they
   A. usually increase a gem’s value.
   B. usually create attractive phenomena.
   C. always identify a gem’s geographic origin.
   D. can help separate natural from synthetic gems.

Answer 7

can help separate natural from synthetic gems

Question 8

1. The term “silk” describes
   A. intersecting fractures.
   B. intersecting scratches.
   C. a group of included crystals.
   D. a group of fine, needle-like inclusions.

Answer 8

a group of fine, needle-like inclusions

Question 9

1. An angular, hollow space that resembles a mineral inclusion is called a
   A. needle.
   B. crystal.
   C. pinpoint.
   D. negative crystal.

Answer 9

negative crystal

Question 10

1. Growth zoning in a colored stone is evidence of
   A. fashioning.
   B. heat treatment.
   C. crystal growth.
   D. fracture filling.

Answer 10

crystal growth

Question 11

1. Which of these clarity characteristics usually have the greatest impact on a gem’s marketability?
   A. A cavity on its pavilion
   B. A large, unhealed feather under its table
   C. A small, dark crystal under its crown facets
   D. A low-relief liquid inclusion under its table

Answer 11

A large, unhealed feather under its table

Question 12

1. In which colored stone clarity type are the gems usually eye-clean?
   A. Type I
   B. Type II
   C. Type III
   D. Type IV

Answer 12

Type 1

Question 13

1. A characteristic or irregularity confined to the surface of a polished gemstone is a(n)
   A. cavity.
   B. blemish.
   C. fracture.
   D. inclusion.

Answer 13

Blemish

Question 14

1. Gems that are usually eye-clean include
   A. peridot, spinel, and quartz.
   B. ruby, alexandrite, and andalusite.
   C. spodumene, yellow beryl, and aquamarine.
   D. red beryl, emerald, and watermelon tourmaline.

Answer 14

spodumene, yellow beryl, and aquamarine

Question 15

1. An inclusion with the most negative impact on a colored stone’s clarity would be located
   A. near the girdle.
   B. under the table.
   C. under a crown facet.
   D. under a crown main.

Answer 15

under the table.