23 Questions
What is the factor play a significant role in the value of a colored stone?
Clarity characteristics
Why do cutters often leave cavities in less noticeable areas of a stone?
To avoid weight loss from expensive rough
What determines the influence of clarity characteristics on a stone's marketability?
Nature, size, number, position, and relief
What is the highest colored stone clarity grade?
Eye-clean
What is an important skill for a successful stone buyer?
The ability to quickly judge a gem's quality with the unaided eye
What type of inclusion is a hollow tube that might be filled with liquid or gas?
Needle
What is a characteristic or irregularity confined to the surface of a polished gemstone?
Blemish
What is a damaged area on a gem, usually near the girdle?
Chip
What is the primary purpose of a cutter leaving cavities in certain areas of a stone?
To reduce the weight loss of expensive rough
Which of the following inclusions is typically found in groups?
Pinpoint
What is the term for the ability to judge a gem's quality with the unaided eye?
Unaided evaluation
Why are some types of colored stones assessed according to different clarity standards?
Because they are typically more included
What is the term for tiny nicks and pits caused by wear and damage to a gem's facet edges or culet?
Abrasion
What is the term for an angular, hollow space within a gem that resembles a mineral inclusion?
Negative crystal
When examining expensive stones, what is recommended to use in addition to the unaided eye?
A jeweler's loupe
What is the term for a mineral crystal trapped within a gem as it grows?
Included crystal
What is a group of needle-like inclusions ?
Silk
A linear scrape, normally seen as a fine curved or straight white line ?
Scratch
Tiny parallel grooves on a facet surface left by the polishing operation?
Polish Lines
Any hazy or milky area that cannot be described as feather, fingerprint, or group of included crystals or needles is a..... ?
Cloud
A fingerprint inclusion is ....?
A inclusion that forms a pattern that resembles a human fingerprint
A contrast between a inclusion and its host gem is ..?
Relief
A general term for a break in a gem is ....?
Feather
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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