gem 220 colored stones assignment 10

In which of the following colored stone clarity grades do the definitions vary for each clarity type?

Moderately included

In which colored stone clarity type are the gems usually eye-clean?

Type I

The term "silk" describes

a group of fine, needle-like inclusions

Which of these gems is classified as Type III?

emerald

The highest clarity grade for colored stones is

eye clean

A general term for a break in a stone is

feather

Which of these clarity characteristics usually have the greatest impact on a gem's marketability?

large, unhealed feather under its table

An angular, hollow space that resembles a mineral inclusion is called a

negative crystal.

Fingerprints are

partially healed fracture planes

Two factors that determine an inclusion's impact on a gem's value are

position and relief.

Gems that are usually eye-clean include

spodumene, yellow beryl, and aquamarine.

An inclusion with the most negative impact on a colored stone's clarity would be located

under the table.

A characteristic or irregularity confined to the surface of a polished gemstone is a(n)

blemish.

Inclusions are important to gemologists because they

can help separate natural from synthetic gems.

Growth zoning in a colored stone is evidence of

crystal growth