Clarity

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Questions and Answers

What is the factor play a significant role in the value of a colored stone?

Color intensity

Cut quality

Carat weight

Clarity characteristics (correct)

Why do cutters often leave cavities in less noticeable areas of a stone?

To increase the stone's brilliance

To avoid weight loss from expensive rough (correct)

To improve the stone's clarity grade

To make the stone more durable

What determines the influence of clarity characteristics on a stone's marketability?

Brilliance, fire, and durability

Nature, size, number, position, and relief (correct)

Shape, size, color, and clarity

Cut quality, carat weight, color intensity, and clarity

What is the highest colored stone clarity grade?

Eye-clean Signup and view all the answers

What is an important skill for a successful stone buyer?

The ability to quickly judge a gem's quality with the unaided eye Signup and view all the answers

What type of inclusion is a hollow tube that might be filled with liquid or gas?

Needle Signup and view all the answers

What is a characteristic or irregularity confined to the surface of a polished gemstone?

Blemish Signup and view all the answers

What is a damaged area on a gem, usually near the girdle?

Chip Signup and view all the answers

What is the primary purpose of a cutter leaving cavities in certain areas of a stone?

To reduce the weight loss of expensive rough Signup and view all the answers

Which of the following inclusions is typically found in groups?

Pinpoint Signup and view all the answers

What is the term for the ability to judge a gem's quality with the unaided eye?

Unaided evaluation Signup and view all the answers

Why are some types of colored stones assessed according to different clarity standards?

Because they are typically more included Signup and view all the answers

What is the term for tiny nicks and pits caused by wear and damage to a gem's facet edges or culet?

Abrasion Signup and view all the answers

What is the term for an angular, hollow space within a gem that resembles a mineral inclusion?

Negative crystal Signup and view all the answers

When examining expensive stones, what is recommended to use in addition to the unaided eye?

A jeweler's loupe Signup and view all the answers

What is the term for a mineral crystal trapped within a gem as it grows?

Included crystal Signup and view all the answers

What is a group of needle-like inclusions ?

Silk Signup and view all the answers

A linear scrape, normally seen as a fine curved or straight white line ?

Scratch Signup and view all the answers

Tiny parallel grooves on a facet surface left by the polishing operation?

Polish Lines Signup and view all the answers

Any hazy or milky area that cannot be described as feather, fingerprint, or group of included crystals or needles is a..... ?

Cloud Signup and view all the answers

A fingerprint inclusion is ....?

A inclusion that forms a pattern that resembles a human fingerprint Signup and view all the answers

A contrast between a inclusion and its host gem is ..?

Relief Signup and view all the answers

A general term for a break in a gem is ....?

Feather Signup and view all the answers

Study Notes

Clarity Characteristics

Clarity characteristics that affect transparency, brilliance, or durability have the most influence on value.
Five factors determine the influence of clarity characteristics on marketability: nature, size, number, position, and relief.

Clarity Grades

Eye-clean is the highest colored stone clarity grade.

Gemstone Inclusions

Abrasions: tiny nicks and pits caused by wear and damage to a gem's facet edges or culet.
Included crystal: a mineral crystal trapped within a gem as it grows.
Blemish: a characteristic or irregularity confined to the surface of a polished gemstone.
Needle: a long, thin inclusion that can be a solid crystal or a hollow tube that might be filled with liquid or gas.
Cavity: an opening that extends into a gem from the surface.
Negative crystal: an angular, hollow space within a gem that resembles a mineral inclusion.
Chip: a damaged area on a gem, usually near the girdle.
Pinpoint: a minute inclusion enclosed within a gem; can occur singly or in groups called clouds.

Gemstone Buying

A successful stone buyer should be able to quickly judge a gem's quality with the unaided eye.
It's essential to examine expensive stones carefully with a loupe.
Some types of colored stones are typically more included than others, so they're assessed according to different clarity standards.

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